使用T-SQL进行模糊匹配

我有一个表的人与personaldata等。有很多专栏，但这里有趣的是：addressindex，lastname以及firstname在addressindex公寓门口向下钻取的唯一地址。因此，如果我有“喜欢以下”两个人，lastname并且有一个firstnames相同，则很可能是重复的。

我需要一种列出这些重复项的方法。

tabledata:

personid     1
firstname    "Carl"
lastname     "Anderson"
addressindex 1

personid     2
firstname    "Carl Peter"
lastname     "Anderson"
addressindex 1

我知道如果要在所有列上都完全匹配怎么办，但是我需要模糊匹配来完成（从上面的示例中）这样的结果：

Row     personid      addressindex     lastname     firstname
1       2             1                Anderson     Carl Peter
2       1             1                Anderson     Carl
.....

关于如何以良好方式解决此问题的任何提示？

我发现SQL Server提供给您执行模糊匹配的功能非常笨拙。使用Levenshtein距离算法和一些加权功能，我对自己的CLR函数非常满意。然后，使用该算法，我创建了一个名为GetSimilarityScore的UDF，该UDF接受两个字符串并返回0.0到1.0之间的分数。匹配越接近1.0越好。然后，使用阈值> = 0.8左右的查询来获取最可能的匹配项。像这样：

if object_id('tempdb..#similar') is not null drop table #similar
select a.id, (
    select top 1 x.id
   from MyTable x
   where x.id <> a.id
   order by dbo.GetSimilarityScore(a.MyField, x.MyField) desc
) as MostSimilarId
into #similar
from MyTable a

select *, dbo.GetSimilarityScore(a.MyField, c.MyField)
from MyTable a
join #similar b on a.id = b.id
join MyTable c on b.MostSimilarId = c.id

只是不要在非常大的桌子上这样做。这是一个缓慢的过程。

这是CLR UDF：

''' <summary>
''' Compute the distance between two strings.
''' </summary>
''' <param name="s1">The first of the two strings.</param>
''' <param name="s2">The second of the two strings.</param>
''' <returns>The Levenshtein cost.</returns>
<Microsoft.SqlServer.Server.SqlFunction()> _
Public Shared Function ComputeLevenstheinDistance(ByVal string1 As SqlString, ByVal string2 As SqlString) As SqlInt32
    If string1.IsNull OrElse string2.IsNull Then Return SqlInt32.Null
    Dim s1 As String = string1.Value
    Dim s2 As String = string2.Value

    Dim n As Integer = s1.Length
    Dim m As Integer = s2.Length
    Dim d As Integer(,) = New Integer(n, m) {}

    ' Step 1
    If n = 0 Then Return m
    If m = 0 Then Return n

    ' Step 2
    For i As Integer = 0 To n
        d(i, 0) = i
    Next

    For j As Integer = 0 To m
        d(0, j) = j
    Next

    ' Step 3
    For i As Integer = 1 To n
        'Step 4
        For j As Integer = 1 To m
            ' Step 5
            Dim cost As Integer = If((s2(j - 1) = s1(i - 1)), 0, 1)

            ' Step 6
            d(i, j) = Math.Min(Math.Min(d(i - 1, j) + 1, d(i, j - 1) + 1), d(i - 1, j - 1) + cost)
        Next
    Next
    ' Step 7
    Return d(n, m)
End Function

''' <summary>
''' Returns a score between 0.0-1.0 indicating how closely two strings match.  1.0 is a 100%
''' T-SQL equality match, and the score goes down from there towards 0.0 for less similar strings.
''' </summary>
<Microsoft.SqlServer.Server.SqlFunction()> _
Public Shared Function GetSimilarityScore(string1 As SqlString, string2 As SqlString) As SqlDouble
    If string1.IsNull OrElse string2.IsNull Then Return SqlInt32.Null

    Dim s1 As String = string1.Value.ToUpper().TrimEnd(" "c)
    Dim s2 As String = string2.Value.ToUpper().TrimEnd(" "c)
    If s1 = s2 Then Return 1.0F ' At this point, T-SQL would consider them the same, so I will too

    Dim flatLevScore As Double = InternalGetSimilarityScore(s1, s2)

    Dim letterS1 As String = GetLetterSimilarityString(s1)
    Dim letterS2 As String = GetLetterSimilarityString(s2)
    Dim letterScore As Double = InternalGetSimilarityScore(letterS1, letterS2)

    'Dim wordS1 As String = GetWordSimilarityString(s1)
    'Dim wordS2 As String = GetWordSimilarityString(s2)
    'Dim wordScore As Double = InternalGetSimilarityScore(wordS1, wordS2)

    If flatLevScore = 1.0F AndAlso letterScore = 1.0F Then Return 1.0F
    If flatLevScore = 0.0F AndAlso letterScore = 0.0F Then Return 0.0F

    ' Return weighted result
    Return (flatLevScore * 0.2F) + (letterScore * 0.8F)
End Function

Private Shared Function InternalGetSimilarityScore(s1 As String, s2 As String) As Double
    Dim dist As SqlInt32 = ComputeLevenstheinDistance(s1, s2)
    Dim maxLen As Integer = If(s1.Length > s2.Length, s1.Length, s2.Length)
    If maxLen = 0 Then Return 1.0F
    Return 1.0F - Convert.ToDouble(dist.Value) / Convert.ToDouble(maxLen)
End Function

''' <summary>
''' Sorts all the alpha numeric characters in the string in alphabetical order
''' and removes everything else.
''' </summary>
Private Shared Function GetLetterSimilarityString(s1 As String) As String
    Dim allChars = If(s1, "").ToUpper().ToCharArray()
    Array.Sort(allChars)
    Dim result As New StringBuilder()
    For Each ch As Char In allChars
        If Char.IsLetterOrDigit(ch) Then
            result.Append(ch)
        End If
    Next
    Return result.ToString()
End Function

''' <summary>
''' Removes all non-alpha numeric characters and then sorts
''' the words in alphabetical order.
''' </summary>
Private Shared Function GetWordSimilarityString(s1 As String) As String
    Dim words As New List(Of String)()
    Dim curWord As StringBuilder = Nothing
    For Each ch As Char In If(s1, "").ToUpper()
        If Char.IsLetterOrDigit(ch) Then
            If curWord Is Nothing Then
                curWord = New StringBuilder()
            End If
            curWord.Append(ch)
        Else
            If curWord IsNot Nothing Then
                words.Add(curWord.ToString())
                curWord = Nothing
            End If
        End If
    Next
    If curWord IsNot Nothing Then
        words.Add(curWord.ToString())
    End If

    words.Sort(StringComparer.OrdinalIgnoreCase)
    Return String.Join(" ", words.ToArray())
End Function

除了这里的其他有用信息之外，您可能还想考虑使用Double Metaphone语音算法，该算法通常被认为比SOUNDEX更好。

Tim Pfeiffer在他的文章Double Metaphone Sounds Great中详细介绍了SQL的实现。将C ++ Double Metaphone算法转换为T-SQL（最初是在SQL Mag中，然后在SQL Server Pro中）。

这将有助于在拼写错误的情况下匹配名称，例如Carl vs. Karl。

更新：实际的可下载代码似乎消失了，但这是在github存储库上找到的实现，该实现似乎已克隆了原始代码。

我将使用SQL Server全文索引，这将使您可以进行搜索并返回不仅包含单词而且还可能拼写错误的内容。

自从Master Data Services的第一个版本发布以来，您可以获得比SOUNDEX所实现的功能更高级的模糊逻辑算法。因此，只要您已经安装了MDS，就可以在mdq中找到一个称为Sameity （）的函数。模式（MDS数据库）中。

有关其工作方式的更多信息：http : //blog.hoegaerden.be/2011/02/05/finding-like-strings-with-fuzzy-logic-functions-built-into-mds/

我个人使用Jaro-Winkler算法的CLR实现，效果似乎很好-字符串长度超过15个字符时有点费力，并且不喜欢匹配电子邮件地址，但效果很好-可以找到完整的实现指南这里

如果由于某种原因而无法使用CLR函数，则可以尝试通过SSIS包运行数据（使用模糊转换查找）-此处详细介绍

代码的第2部分对于Redfilter中的链接，答案：

参考文献：https :
//github.com/mb16/geocoderNet/blob/master/build/sql/doubleMetaphone.sql

BEGIN
                        SET @MP1 = @MP1 + 'N'
                        SET @MP2 = @MP2 + 'KN'
                    END
                                    ELSE
                    BEGIN
                        SET @MP1 = @MP1 + 'KN'
                        SET @MP2 = @MP2 + 'KN'
                    END
                END
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    --'tagliaro'
                    ELSE IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,'LI')=1) AND 
(dbo.fnSlavoGermanic(@Word)=0)
                    BEGIN
                SET @MP1 = @MP1 + 'KL'
                SET @MP2 = @MP2 + 'L'
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    -- -ges-,-gep-,-gel-, -gie- at beginning
            -- This call to fnStringAt() is the 'worst case' in number of values passed. A UDF that used DEFAULT values instead of
                        -- a multi-valued argument would require ten DEFAULT arguments for EP, EB, EL, etc. (assuming the first was not defined with a DEFAULT).
                    ELSE IF ((@CurrentPosition = 1)
                            AND ((SUBSTRING(@Word,@CurrentPosition + 1,1) = 'Y') 
                                    OR (dbo.fnStringAt((@CurrentPosition + 
1),@Word,'ES,EP,EB,EL,EY,IB,IL,IN,IE,EI,ER')=1)) )
                    BEGIN
                SET @MP1 = @MP1 + 'K'
                SET @MP2 = @MP2 + 'J'
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    -- -ger-,  -gy-
                    ELSE IF (((dbo.fnStringAt((@CurrentPosition + 1), @Word, 'ER')=1) OR 
(SUBSTRING(@Word,@CurrentPosition + 1,1) = 'Y'))
                                    AND (dbo.fnStringAt(1, @Word, 'DANGER,RANGER,MANGER')=0)
                                            AND (dbo.fnStringAt((@CurrentPosition - 1), @Word, 
'E,I,RGY,OGY')=0) )
                    BEGIN
                SET @MP1 = @MP1 + 'K'
                SET @MP2 = @MP2 + 'J'
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    -- italian e.g, 'biaggi'
                    ELSE IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,'E,I,Y')=1) OR 
(dbo.fnStringAt((@CurrentPosition - 1),@Word,'AGGI,OGGI')=1)
                    BEGIN
                            --obvious germanic
                            IF ((dbo.fnStringAt(1,@Word,'VAN ,VON ,SCH')=1)
                                    OR (dbo.fnStringAt((@CurrentPosition + 1),@Word,'ET')=1))
                BEGIN
                    SET @MP1 = @MP1 + 'K'
                    SET @MP2 = @MP2 + 'K'
                END
                            ELSE
                BEGIN
                                    --always soft if french ending
                                    IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,'IER ')=1)
                    BEGIN
                        SET @MP1 = @MP1 + 'J'
                        SET @MP2 = @MP2 + 'J'
                    END
                                    ELSE
                    BEGIN
                        SET @MP1 = @MP1 + 'J'
                        SET @MP2 = @MP2 + 'K'
                    END
                END
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

            ELSE
            BEGIN
                        IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'G')
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                        ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 1
                END
                SET @MP1 = @MP1 + 'K'
                SET @MP2 = @MP2 + 'K'
            END
        END

        ELSE IF @CurrentChar = 'H'
        BEGIN
                    --only keep if first & before vowel or btw. 2 vowels
                    IF (((@CurrentPosition = 1) OR 
(dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition - 1,1))=1)) 
                            AND (dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition + 1,1))=1))
                    BEGIN
                SET @MP1 = @MP1 + 'H'
                SET @MP2 = @MP2 + 'H'
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    --also takes care of 'HH'
                    ELSE 
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
        END

        ELSE IF @CurrentChar = 'J'
        BEGIN
                    --obvious spanish, 'jose', 'san jacinto'
                    IF (dbo.fnStringAt(@CurrentPosition,@Word,'JOSE')=1) OR 
(dbo.fnStringAt(1,@Word,'SAN ')=1)
                    BEGIN
                            IF (((@CurrentPosition = 1) AND (SUBSTRING(@Word,@CurrentPosition 
+ 4,1) = ' ')) OR (dbo.fnStringAt(1,@Word,'SAN ')=1) )
                BEGIN
                    SET @MP1 = @MP1 + 'H'
                    SET @MP2 = @MP2 + 'H'
                END
                            ELSE
                            BEGIN
                    SET @MP1 = @MP1 + 'J'
                    SET @MP2 = @MP2 + 'H'
                            END
                            SET @CurrentPosition = @CurrentPosition + 1
                    END

                    ELSE IF ((@CurrentPosition = 1) AND 
(dbo.fnStringAt(@CurrentPosition,@Word,'JOSE')=0))
            BEGIN
                SET @MP1 = @MP1 + 'J'
                --Yankelovich/Jankelowicz
                SET @MP2 = @MP2 + 'A' 
                        --it could happen!
                        IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'J') 
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                        ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 1
                END
            END
                    ELSE
            BEGIN
                            --spanish pron. of e.g. 'bajador'
                            IF( (dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition - 1,1))=1)
                                    AND (dbo.fnSlavoGermanic(@Word)=0)
                                            AND ((SUBSTRING(@Word,@CurrentPosition + 1,1) = 'A') OR 
(SUBSTRING(@Word,@CurrentPosition + 1,1) = 'O')))
                BEGIN
                    SET @MP1 = @MP1 + 'J'
                    SET @MP2 = @MP2 + 'H'
                END
                            ELSE
                BEGIN
                                    IF (@CurrentPosition = @WordLength)
                    BEGIN
                        SET @MP1 = @MP1 + 'J'
                        SET @MP2 = @MP2 + ''
                    END
                                    ELSE
                    BEGIN
                                            IF ((dbo.fnStringAt((@CurrentPosition + 1), @Word, 
'L,T,K,S,N,M,B,Z')=0) 
                                                            AND (dbo.fnStringAt((@CurrentPosition - 1), @Word, 
'S,K,L')=0))
                        BEGIN
                            SET @MP1 = @MP1 + 'J'
                            SET @MP2 = @MP2 + 'J'
                        END
                    END
                END
                        --it could happen!
                        IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'J') 
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                        ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 1
                END
            END
        END

        ELSE IF @CurrentChar = 'K'
        BEGIN
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'K')
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
            SET @MP1 = @MP1 + 'K'
            SET @MP2 = @MP2 + 'K'
        END

        ELSE IF @CurrentChar = 'L'
        BEGIN
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'L')
                    BEGIN
                            --spanish e.g. 'cabrillo', 'gallegos'
                            IF (((@CurrentPosition = (@WordLength - 3)) 
                                    AND (dbo.fnStringAt((@CurrentPosition - 
1),@Word,'ILLO,ILLA,ALLE')=1))
                                             OR (((dbo.fnStringAt((@WordLength - 1),@Word,'AS,OS')=1) 
OR (dbo.fnStringAt(@WordLength,@Word,'A,O')=1)) 
                                                    AND (dbo.fnStringAt((@CurrentPosition - 
1),@Word,'ALLE')=1)) )
                            BEGIN
                    SET @MP1 = @MP1 + 'L'
                    SET @MP2 = @MP2 + ''
                                SET @CurrentPosition = @CurrentPosition + 2
                            END
                ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                    SET @MP1 = @MP1 + 'L'
                    SET @MP2 = @MP2 + 'L'
                END
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
                SET @MP1 = @MP1 + 'L'
                SET @MP2 = @MP2 + 'L'
            END
        END

        ELSE IF @CurrentChar = 'M'
        BEGIN
                     --'dumb','thumb'
                    IF (((dbo.fnStringAt((@CurrentPosition - 1), @Word,'UMB')=1)
                            AND (((@CurrentPosition + 1) = @WordLength) OR 
(dbo.fnStringAt((@CurrentPosition + 2),@Word,'ER')=1)))

                                    OR (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'M') )
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
            SET @MP1 = @MP1 + 'M'
            SET @MP2 = @MP2 + 'M'
        END

        ELSE IF @CurrentChar = 'N'
        BEGIN
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'N')
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
            SET @MP1 = @MP1 + 'N'
            SET @MP2 = @MP2 + 'N'
        END

        ELSE IF @CurrentChar = 'Ñ'
        BEGIN
                        SET @CurrentPosition = @CurrentPosition + 1
            SET @MP1 = @MP1 + 'N'
            SET @MP2 = @MP2 + 'N'
        END

        ELSE IF @CurrentChar = 'P'
        BEGIN
                    --What about Michelle Pfeiffer, star of Grease 2? Price-Pfister?, Pfizer?
                    --Don't just look for an 'F' next, what about 'topflight', helpful, campfire, leapfrog, stepfather
                    --Sorry, Mark Knopfler, I don't know how to help you
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'H')

                OR ((@CurrentPosition = 1) AND 
(SUBSTRING(@Word,@CurrentPosition + 1,1) = 'F') AND 
(dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition+2,1))=1))
                    BEGIN
                SET @MP1 = @MP1 + 'F'
                SET @MP2 = @MP2 + 'F'
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    --also account for "campbell", "raspberry"
                    ELSE 
            BEGIN
                IF (dbo.fnStringAt((@CurrentPosition + 1),@Word, 'P,B')=1)
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                        ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 1
                END
                SET @MP1 = @MP1 + 'P'
                SET @MP2 = @MP2 + 'P'
            END
        END

        ELSE IF @CurrentChar = 'Q'
        BEGIN
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'Q')
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
            SET @MP1 = @MP1 + 'K'
            SET @MP2 = @MP2 + 'K'
        END

        ELSE IF @CurrentChar = 'R'
        BEGIN
            --QQ: Will SQL short circuit eval? Otherwise, I could try to read before string begins here...
                    --french e.g. 'rogier', but exclude 'hochmeier'
                    IF ((@CurrentPosition = @WordLength)
                            AND (dbo.fnSlavoGermanic(@Word)=0)
                                    AND (dbo.fnStringAt((@CurrentPosition - 2), @Word, 'IE')=1) 
                                            AND (dbo.fnStringAt((@CurrentPosition - 4), @Word, 
'ME,MA')=0))
            BEGIN
                SET @MP1 = @MP1 + ''
                SET @MP2 = @MP2 + 'R'
            END
                    ELSE
            BEGIN
                SET @MP1 = @MP1 + 'R'
                SET @MP2 = @MP2 + 'R'
            END

                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'R')
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
        END

        ELSE IF @CurrentChar = 'S'
        BEGIN
                    --special cases 'island', 'isle', 'carlisle', 'carlysle'
                    IF (dbo.fnStringAt((@CurrentPosition - 1), @Word, 'ISL,YSL')=1)
                    BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
                    END

                    --special case 'sugar-'
                    ELSE IF ((@CurrentPosition = 1) AND (dbo.fnStringAt(@CurrentPosition, 
@Word, 'SUGAR')=1))
                    BEGIN
                SET @MP1 = @MP1 + 'X'
                SET @MP2 = @MP2 + 'S'
                            SET @CurrentPosition = @CurrentPosition + 1
                    END

                    ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'SH')=1)
                    BEGIN
                            --germanic
                            IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 
'HEIM,HOEK,HOLM,HOLZ')=1)
                BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'S'
                END
                            ELSE
                BEGIN
                    SET @MP1 = @MP1 + 'X'
                    SET @MP2 = @MP2 + 'X'
                END
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    --italian & armenian
                    ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'SIO,SIA')=1) OR 
(dbo.fnStringAt(@CurrentPosition, @Word, 'SIAN')=1)
                    BEGIN
                            IF (dbo.fnSlavoGermanic(@Word)=0)
                BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'X'
                END
                            ELSE
                BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'S'
                END
                            SET @CurrentPosition = @CurrentPosition + 3
                    END

                    --german & anglicisations, e.g. 'smith' match 'schmidt', 'snider' match 'schneider'
                    --also, -sz- in slavic language altho in hungarian it is pronounced 's'
                    ELSE IF (((@CurrentPosition = 1) 
                                    AND (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'M,N,L,W')=1))
                                            OR (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'Z')=1))
                    BEGIN
                SET @MP1 = @MP1 + 'S'
                SET @MP2 = @MP2 + 'X'
                            IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'Z')=1)
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                            ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 1
                            END
                    END

                    ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'SC')=1)
                    BEGIN
                            --Schlesinger's rule
                            IF (SUBSTRING(@Word,@CurrentPosition + 2,1) = 'H')
                BEGIN
                                    --dutch origin, e.g. 'school', 'schooner'
                                    IF (dbo.fnStringAt((@CurrentPosition + 3), @Word, 
'OO,ER,EN,UY,ED,EM')=1)
                                    BEGIN
                                            --'schermerhorn', 'schenker'
                                            IF (dbo.fnStringAt((@CurrentPosition + 3), @Word, 'ER,EN')=1)
                                            BEGIN
                            SET @MP1 = @MP1 + 'X'
                            SET @MP2 = @MP2 + 'SK'
                        END
                                            ELSE
                        BEGIN
                            SET @MP1 = @MP1 + 'SK'
                            SET @MP2 = @MP2 + 'SK'
                        END
                                    SET @CurrentPosition = @CurrentPosition + 3
                    END
                                    ELSE
                    BEGIN
                                            IF ((@CurrentPosition = 1) AND 
(dbo.fnIsVowel(SUBSTRING(@Word,3,1))=0) AND (SUBSTRING(@Word,3,1) <> 'W'))
                        BEGIN
                            SET @MP1 = @MP1 + 'X'
                            SET @MP2 = @MP2 + 'S'
                        END
                                            ELSE
                        BEGIN
                            SET @MP1 = @MP1 + 'X'
                            SET @MP2 = @MP2 + 'X'
                        END
                                    SET @CurrentPosition = @CurrentPosition + 3
                                    END
                END

                            ELSE IF (dbo.fnStringAt((@CurrentPosition + 2), @Word, 'I,E,Y')=1)
                            BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'S'
                                SET @CurrentPosition = @CurrentPosition + 3
                            END
                            ELSE
                BEGIN
                    SET @MP1 = @MP1 + 'SK'
                    SET @MP2 = @MP2 + 'SK'
                                SET @CurrentPosition = @CurrentPosition + 3
                            END
                    END

                    ELSE 
            BEGIN
                        --french e.g. 'resnais', 'artois'
                IF ((@CurrentPosition = @WordLength) AND 
(dbo.fnStringAt((@CurrentPosition - 2), @Word, 'AI,OI')=1))
                BEGIN
                    SET @MP1 = @MP1 + ''
                    SET @MP2 = @MP2 + 'S'
                END
                        ELSE
                BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'S'
                END

                        IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'S,Z')=1)
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                        ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 1
                END
            END
        END

        ELSE IF @CurrentChar = 'T'
        BEGIN
                    IF (dbo.fnStringAt(@CurrentPosition, @Word, 'TION,TIA,TCH')=1)
                    BEGIN
                SET @MP1 = @MP1 + 'X'
                SET @MP2 = @MP2 + 'X'
                            SET @CurrentPosition = @CurrentPosition + 3
            END

                    ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'TH,TTH')=1) 
                    BEGIN
                            --special case 'thomas', 'thames' or germanic
                            IF (dbo.fnStringAt((@CurrentPosition + 2), @Word, 'OM,AM')=1) 
                                    OR (dbo.fnStringAt(1, @Word, 'VAN ,VON ,SCH')=1) 
                            BEGIN
                    SET @MP1 = @MP1 + 'T'
                    SET @MP2 = @MP2 + 'T'
                END
                            ELSE    
                BEGIN
                    SET @MP1 = @MP1 + '0'
                    SET @MP2 = @MP2 + 'T'
                            END
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

            ELSE
            BEGIN
                        IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'T,D')=1)
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                        ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 1
                END
                SET @MP1 = @MP1 + 'T'
                SET @MP2 = @MP2 + 'T'
            END
        END

        ELSE IF @CurrentChar = 'V'
        BEGIN
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'V')
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
            SET @MP1 = @MP1 + 'F'
            SET @MP2 = @MP2 + 'F'
        END

        ELSE IF @CurrentChar = 'W'
        BEGIN
                    --can also be in middle of word
                    IF (dbo.fnStringAt(@CurrentPosition, @Word, 'WR')=1)
                    BEGIN
                SET @MP1 = @MP1 + 'R'
                SET @MP2 = @MP2 + 'R'
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    ELSE IF ((@CurrentPosition = 1) 
                            AND ((dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition + 1,1))=1) 
OR (dbo.fnStringAt(@CurrentPosition, @Word, 'WH')=1)))
                    BEGIN
                            --Wasserman should match Vasserman
                            IF (dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition + 1,1))=1)
                BEGIN
                    SET @MP1 = @MP1 + 'A'
                    SET @MP2 = @MP2 + 'F'
                END
                            ELSE
                BEGIN
                                    --need Uomo to match Womo
                    SET @MP1 = @MP1 + 'A'
                    SET @MP2 = @MP2 + 'A'
                END
                            SET @CurrentPosition = @CurrentPosition + 1
                    END

                    --Arnow should match Arnoff
                    ELSE IF (((@CurrentPosition = @WordLength) AND 
(dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition - 1,1))=1)) 
                            OR (dbo.fnStringAt((@CurrentPosition - 1), @Word, 
'EWSKI,EWSKY,OWSKI,OWSKY')=1) 
                                            OR (dbo.fnStringAt(1, @Word, 'SCH')=1))
                    BEGIN
                SET @MP1 = @MP1 + ''
                SET @MP2 = @MP2 + 'F'
                            SET @CurrentPosition = @CurrentPosition + 1
            END

                    --polish e.g. 'filipowicz'
                    ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'WICZ,WITZ')=1)
                    BEGIN
                SET @MP1 = @MP1 + 'TS'
                SET @MP2 = @MP2 + 'FX'
                            SET @CurrentPosition = @CurrentPosition + 4
            END
    -- skip it
                    ELSE 
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
        END

        ELSE IF @CurrentChar = 'X'
        BEGIN
                    --french e.g. breaux
                    IF (NOT((@CurrentPosition = @WordLength) 
                            AND ((dbo.fnStringAt((@CurrentPosition - 3), @Word, 'IAU,EAU')=1) 
                                            OR (dbo.fnStringAt((@CurrentPosition - 2), @Word, 
'AU,OU')=1))) )
            BEGIN
                SET @MP1 = @MP1 + 'KS'
                SET @MP2 = @MP2 + 'KS'
            END

                    IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'C,X')=1)
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
        END

        ELSE IF @CurrentChar = 'Z'
        BEGIN
                    --chinese pinyin e.g. 'zhao'
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'H')
                    BEGIN
                SET @MP1 = @MP1 + 'J'
                SET @MP2 = @MP2 + 'J'
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            IF ((dbo.fnStringAt((@CurrentPosition + 1), @Word, 'ZO,ZI,ZA')=1) 
                                    OR ((dbo.fnSlavoGermanic(@Word)=1) AND ((@CurrentPosition > 
1) AND SUBSTRING(@Word,@CurrentPosition - 1,1) <> 'T')))
                            BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'TS'
                            END
                            ELSE
                BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'S'
                END
                        IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'Z')
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                        ELSE
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 1
                        END
            END
        END

            ELSE
        BEGIN
                        SET @CurrentPosition = @CurrentPosition + 1
        END
    END

        --only give back 4 char metaphone
        IF (LEN(@MP1) > 4)
    BEGIN
        SET @MP1 = LEFT(@MP1, 4)
    END
        IF (LEN(@MP2) > 4)
    BEGIN
        SET @MP2 = LEFT(@MP2, 4)
    END
    IF @MP2 = @MP1
    BEGIN
        SET @MP2 = ''
    END

    INSERT @DMP(Metaphone1,Metaphone2) VALUES( @MP1, @MP2 )
    RETURN
END
GO;
------------------------------------------------------------------------
IF OBJECT_ID('fnDoubleMetaphoneScalar') IS NOT NULL BEGIN DROP FUNCTION 
fnDoubleMetaphoneScalar END
GO;
CREATE FUNCTION fnDoubleMetaphoneScalar( @MetaphoneType int, @Word varchar(50) )
RETURNS char(4)
AS
BEGIN
        RETURN (SELECT CASE @MetaphoneType WHEN 1 THEN Metaphone1 
WHEN 2 THEN Metaphone2 END FROM fnDoubleMetaphoneTable( @Word ))
END

您可以在SQL Server中使用SOUNDEX和相关的DIFFERENCE函数查找相似的名称。MSDN上的参考在这里。

关于重复数据删除，您的字符串拆分和匹配是很好的首选。如果有关于数据的已知项目可以用来减少工作量和/或产生更好的结果，则最好利用它们。请记住，尽管您可以通过自动捕获尽可能多的数据然后生成“不确定性案例”的报告来简化工作，但通常经常无法完全消除手工工作。

关于名称匹配：SOUNDEX的匹配质量非常糟糕，特别是对于您要尝试的工作类型而言很糟糕，因为它会匹配距离目标太远的事物。最好结合使用双重元音结果和Levenshtein距离来进行名称匹配。有了适当的偏见，此方法就可以很好地工作，并且可能在对您的已知信息进行清理之后可以用于第二遍。

您可能还需要考虑使用SSIS包并研究模糊查找和分组转换（http://msdn.microsoft.com/zh-cn/library/ms345128(SQL.90).aspx）。

也可以使用SQL全文本搜索（http://msdn.microsoft.com/zh-cn/library/cc879300.aspx），但可能不适用于您的特定问题域。

分两部分粘贴RedFilter代码，以避免链接腐烂

参考：
https : //github.com/mb16/geocoderNet/blob/master/build/sql/doubleMetaphone.sql第1部分：

--WEB LISTING 1: Double Metaphone Script

-------------------------------------
IF OBJECT_ID('fnIsVowel') IS NOT NULL BEGIN DROP FUNCTION fnIsVowel END
GO;
CREATE FUNCTION fnIsVowel( @c char(1) )
RETURNS bit
AS
BEGIN
    IF (@c = 'A') OR (@c = 'E') OR (@c = 'I') OR (@c = 'O') OR (@c = 'U') OR (@c = 'Y') 
    BEGIN
        RETURN 1
    END
    --'ELSE' would worry SQL Server, it wants RETURN last in a scalar function
    RETURN 0
END
GO;
-----------------------------------------------
IF OBJECT_ID('fnSlavoGermanic') IS NOT NULL BEGIN DROP FUNCTION fnSlavoGermanic 
END
GO;
CREATE FUNCTION fnSlavoGermanic( @Word char(50) )
RETURNS bit
AS
BEGIN
    --Catch NULL also...
    IF (CHARINDEX('W',@Word) > 0) OR (CHARINDEX('K',@Word) > 0) OR 
(CHARINDEX('CZ',@Word) > 0)
    --'WITZ' test is in original Lawrence Philips C++ code, but appears to be a subset of the first test for 'W'
    -- OR (CHARINDEX('WITZ',@Word) > 0)
    BEGIN
        RETURN 1
    END
    --ELSE
        RETURN 0
END
GO;
---------------------------------------------------------------------------------------------------------------------------------
----------------------
--Lawrence Philips calls for a length argument, but this has two drawbacks:
--1. All target strings must be of the same length
--2. It presents an opportunity for subtle bugs, ie fnStringAt( 1, 7, 'Search me please', 'Search' ) returns 0 (no matter what is in the searched string)
--So I've eliminated the argument and fnStringAt checks the length of each target as it executes

--DEFAULTS suck with UDFs. Have to specify DEFAULT in caller - why bother?
IF OBJECT_ID('fnStringAtDef') IS NOT NULL BEGIN DROP FUNCTION fnStringAtDef END
GO;
CREATE FUNCTION fnStringAtDef( @Start int, @StringToSearch varchar(50), 
    @Target1 varchar(50), 
    @Target2 varchar(50) = NULL,
    @Target3 varchar(50) = NULL,
    @Target4 varchar(50) = NULL,
    @Target5 varchar(50) = NULL,
    @Target6 varchar(50) = NULL )
RETURNS bit
AS
BEGIN
    IF CHARINDEX(@Target1,@StringToSearch,@Start) > 0 RETURN 1
    --2 Styles, test each optional argument for NULL, nesting further tests
    --or just take advantage of CHARINDEX behavior with a NULL arg (unless 65 compatibility - code check before CREATE FUNCTION?
    --Style 1:
    --IF @Target2 IS NOT NULL
    --BEGIN
    --  IF CHARINDEX(@Target2,@StringToSearch,@Start) > 0 RETURN 1
    -- (etc.)
    --END
    --Style 2:
    IF CHARINDEX(@Target2,@StringToSearch,@Start) > 0 RETURN 1
    IF CHARINDEX(@Target3,@StringToSearch,@Start) > 0 RETURN 1
    IF CHARINDEX(@Target4,@StringToSearch,@Start) > 0 RETURN 1
    IF CHARINDEX(@Target5,@StringToSearch,@Start) > 0 RETURN 1
    IF CHARINDEX(@Target6,@StringToSearch,@Start) > 0 RETURN 1
    RETURN 0
END
GO;
-------------------------------------------------------------------------------------------------
IF OBJECT_ID('fnStringAt') IS NOT NULL BEGIN DROP FUNCTION fnStringAt END
GO;
CREATE FUNCTION fnStringAt( @Start int, @StringToSearch varchar(50), @TargetStrings 
varchar(2000) )
RETURNS bit
AS
BEGIN
    DECLARE @SingleTarget varchar(50)
    DECLARE @CurrentStart int
    DECLARE @CurrentLength int

    --Eliminate special cases
    --Trailing space is needed to check for end of word in some cases, so always append comma
    --loop tests should fairly quickly ignore ',,' termination
    SET @TargetStrings = @TargetStrings + ','

    SET @CurrentStart = 1
    --Include terminating comma so spaces don't get truncated
    SET @CurrentLength = (CHARINDEX(',',@TargetStrings,@CurrentStart) - 
@CurrentStart) + 1
    SET @SingleTarget = SUBSTRING(@TargetStrings,@CurrentStart,@CurrentLength)
    WHILE LEN(@SingleTarget) > 1
    BEGIN
        IF SUBSTRING(@StringToSearch,@Start,LEN(@SingleTarget)-1) = 
LEFT(@SingleTarget,LEN(@SingleTarget)-1)
        BEGIN
            RETURN 1
        END
        SET @CurrentStart = (@CurrentStart + @CurrentLength)
        SET @CurrentLength = (CHARINDEX(',',@TargetStrings,@CurrentStart) - 
@CurrentStart) + 1
        IF NOT @CurrentLength > 1 --getting trailing comma 
        BEGIN
            BREAK
        END
        SET @SingleTarget = 
SUBSTRING(@TargetStrings,@CurrentStart,@CurrentLength)
    END
    RETURN 0
END
GO;
------------------------------------------------------------------------
IF OBJECT_ID('fnDoubleMetaphoneTable') IS NOT NULL BEGIN DROP FUNCTION 
fnDoubleMetaphoneTable END
GO;
CREATE FUNCTION fnDoubleMetaphoneTable( @Word varchar(50) )
RETURNS @DMP TABLE ( Metaphone1 char(4), Metaphone2 char(4) )
AS
BEGIN
    DECLARE @MP1 varchar(4), @MP2 varchar(4)
    SET @MP1 = ''
    SET @MP2 = ''
    DECLARE @CurrentPosition int, @WordLength int, @CurrentChar char(1)
    SET @CurrentPosition = 1
    SET @WordLength = LEN(@Word)

    IF @WordLength < 1 
    BEGIN
        RETURN
    END

    --ensure case insensitivity
    SET @Word = UPPER(@Word)

    IF dbo.fnStringAt(1, @Word, 'GN,KN,PN,WR,PS') = 1 
    BEGIN
        SET @CurrentPosition = @CurrentPosition + 1
    END

    IF 'X' = LEFT(@Word,1)
    BEGIN
        SET @MP1 = @MP1 + 'S'
        SET @MP2 = @MP2 + 'S'
        SET @CurrentPosition = @CurrentPosition + 1
    END

    WHILE (4 > LEN(RTRIM(@MP1))) OR (4 > LEN(RTRIM(@MP2)))
    BEGIN
        IF @CurrentPosition > @WordLength 
        BEGIN
            BREAK
        END

        SET @CurrentChar = SUBSTRING(@Word,@CurrentPosition,1)

        IF @CurrentChar IN('A','E','I','O','U','Y')
        BEGIN
            IF @CurrentPosition = 1 
            BEGIN
                SET @MP1 = @MP1 + 'A'
                SET @MP2 = @MP2 + 'A'
            END
            SET @CurrentPosition = @CurrentPosition + 1
        END
        ELSE IF @CurrentChar = 'B'
        BEGIN
            SET @MP1 = @MP1 + 'P'
            SET @MP2 = @MP2 + 'P'
            IF 'B' = SUBSTRING(@Word,@CurrentPosition + 1,1) 
            BEGIN
                SET @CurrentPosition = @CurrentPosition + 2
            END
            ELSE 
            BEGIN
                SET @CurrentPosition = @CurrentPosition + 1
            END
        END
        ELSE IF @CurrentChar = 'Ç'
        BEGIN
            SET @MP1 = @MP1 + 'S'
            SET @MP2 = @MP2 + 'S'
            SET @CurrentPosition = @CurrentPosition + 1
        END
        ELSE IF @CurrentChar = 'C'
        BEGIN
            --various germanic
            IF (@CurrentPosition > 2) 
               AND (dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition-2,1))=0) 
               AND (dbo.fnStringAt(@CurrentPosition-1,@Word,'ACH') = 1) 
               AND ((SUBSTRING(@Word,@CurrentPosition+2,1) <> 'I') 
                AND ((SUBSTRING(@Word,@CurrentPosition+2,1) <> 'E') OR 
(dbo.fnStringAt(@CurrentPosition-2,@Word,'BACHER,MACHER')=1)))
            BEGIN
                SET @MP1 = @MP1 + 'K'
                SET @MP2 = @MP2 + 'K'
                SET @CurrentPosition = @CurrentPosition + 2
            END
            -- 'caesar'
            ELSE IF (@CurrentPosition = 1) AND 
(dbo.fnStringAt(@CurrentPosition,@Word,'CAESAR') = 1)
            BEGIN
                SET @MP1 = @MP1 + 'S'
                SET @MP2 = @MP2 + 'S'
                SET @CurrentPosition = @CurrentPosition + 2
            END
            -- 'chianti'
            ELSE IF dbo.fnStringAt(@CurrentPosition,@Word,'CHIA') = 1
            BEGIN
                SET @MP1 = @MP1 + 'K'
                SET @MP2 = @MP2 + 'K'
                SET @CurrentPosition = @CurrentPosition + 2
            END
            ELSE IF dbo.fnStringAt(@CurrentPosition,@Word,'CH') = 1
            BEGIN
                -- Find 'michael'
                IF (@CurrentPosition > 1) AND 
(dbo.fnStringAt(@CurrentPosition,@Word,'CHAE') = 1)
                BEGIN
                    --First instance of alternate encoding
                    SET @MP1 = @MP1 + 'K'
                    SET @MP2 = @MP2 + 'X'
                    SET @CurrentPosition = @CurrentPosition + 2
                END
                --greek roots e.g. 'chemistry', 'chorus'
                ELSE IF (@CurrentPosition = 1) AND (dbo.fnStringAt(2, @Word, 
'HARAC,HARIS,HOR,HYM,HIA,HEM') = 1) AND (dbo.fnStringAt(1,@Word,'CHORE') = 0)
                BEGIN
                    SET @MP1 = @MP1 + 'K'
                    SET @MP2 = @MP2 + 'K'
                    SET @CurrentPosition = @CurrentPosition + 2
                END
                --germanic, greek, or otherwise 'ch' for 'kh' sound
                ELSE IF ((dbo.fnStringAt(1,@Word,'VAN ,VON ,SCH')=1) OR 
                   (dbo.fnStringAt(@CurrentPosition-
2,@Word,'ORCHES,ARCHIT,ORCHID')=1) OR 
                   (dbo.fnStringAt(@CurrentPosition+2,@Word,'T,S')=1) OR 
                   (((dbo.fnStringAt(@CurrentPosition-1,@Word,'A,O,U,E')=1) 
OR 
                   (@CurrentPosition = 1))  
                   AND 
(dbo.fnStringAt(@CurrentPosition+2,@Word,'L,R,N,M,B,H,F,V,W, ')=1)))
                BEGIN
                    SET @MP1 = @MP1 + 'K'
                    SET @MP2 = @MP2 + 'K'
                    SET @CurrentPosition = @CurrentPosition + 2
                END
                ELSE
                BEGIN
                    --is this a given?
                    IF (@CurrentPosition > 1)   
                    BEGIN
                        IF (dbo.fnStringAt(1,@Word,'MC') = 1)
                        BEGIN
                            --eg McHugh
                            SET @MP1 = @MP1 + 'K'
                            SET @MP2 = @MP2 + 'K'
                        END
                        ELSE
                        BEGIN
                            --Alternate encoding
                            SET @MP1 = @MP1 + 'X'
                            SET @MP2 = @MP2 + 'K'
                        END
                    END
                    ELSE
                    BEGIN
                        SET @MP1 = @MP1 + 'X'
                        SET @MP2 = @MP2 + 'X'
                    END
                    SET @CurrentPosition = @CurrentPosition + 2
                END
            END
                    --e.g, 'czerny'
                    ELSE IF (dbo.fnStringAt(@CurrentPosition,@Word,'CZ')=1) AND 
(dbo.fnStringAt((@CurrentPosition - 2),@Word,'WICZ')=0)
                    BEGIN
                SET @MP1 = @MP1 + 'S'
                SET @MP2 = @MP2 + 'X'
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    --e.g., 'focaccia'
                    ELSE IF(dbo.fnStringAt((@CurrentPosition + 1),@Word,'CIA')=1)
                    BEGIN
                SET @MP1 = @MP1 + 'X'
                SET @MP2 = @MP2 + 'X'
                            SET @CurrentPosition = @CurrentPosition + 3
                    END

                    --double 'C', but not if e.g. 'McClellan'
                    ELSE IF(dbo.fnStringAt(@CurrentPosition,@Word,'CC')=1) AND NOT 
((@CurrentPosition = 2) AND (LEFT(@Word,1) = 'M'))
                            --'bellocchio' but not 'bacchus'
                            IF (dbo.fnStringAt((@CurrentPosition + 2),@Word,'I,E,H')=1) AND 
(dbo.fnStringAt((@CurrentPosition + 2),@Word,'HU')=0)
                            BEGIN
                                    --'accident', 'accede' 'succeed'
                                    IF (((@CurrentPosition = 2) AND 
(SUBSTRING(@Word,@CurrentPosition - 1,1) = 'A')) 
                                                    OR (dbo.fnStringAt((@CurrentPosition - 
1),@Word,'UCCEE,UCCES')=1))
                    BEGIN
                        SET @MP1 = @MP1 + 'KS'
                        SET @MP2 = @MP2 + 'KS'
                    END
                                    --'bacci', 'bertucci', other italian
                                    ELSE
                    BEGIN
                        SET @MP1 = @MP1 + 'X'
                        SET @MP2 = @MP2 + 'X'
                    END
                                SET @CurrentPosition = @CurrentPosition + 3
                END
                            --Pierce's rule
                            ELSE 
                BEGIN
                    SET @MP1 = @MP1 + 'K'
                    SET @MP2 = @MP2 + 'K'
                                SET @CurrentPosition = @CurrentPosition + 2
                            END

                    ELSE IF (dbo.fnStringAt(@CurrentPosition,@Word,'CK,CG,CQ')=1)
                    BEGIN
                SET @MP1 = @MP1 + 'K'
                SET @MP2 = @MP2 + 'K'
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    ELSE IF (dbo.fnStringAt(@CurrentPosition,@Word,'CI,CE,CY')=1)
                    BEGIN
                            --italian vs. english
                            IF (dbo.fnStringAt(@CurrentPosition,@Word,'CIO,CIE,CIA')=1)
                BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'X'
                END
                            ELSE
                BEGIN
                    SET @MP1 = @MP1 + 'S'
                    SET @MP2 = @MP2 + 'S'
                END
                            SET @CurrentPosition = @CurrentPosition + 2
                    END

                    ELSE
            BEGIN
                SET @MP1 = @MP1 + 'K'
                SET @MP2 = @MP2 + 'K'

                        --name sent in 'mac caffrey', 'mac gregor
                        IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,' C, Q, G')=1)
                BEGIN
                                SET @CurrentPosition = @CurrentPosition + 3
                END
                        ELSE
                BEGIN
                                IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,'C,K,Q')=1)
                                        AND (dbo.fnStringAt((@CurrentPosition + 1), 2, 'CE,CI')=0)
                    BEGIN
                                    SET @CurrentPosition = @CurrentPosition + 2
                    END
                                ELSE
                    BEGIN
                                    SET @CurrentPosition = @CurrentPosition + 1
                    END
                        END
            END

        END
        ELSE IF @CurrentChar = 'D'
        BEGIN
                    IF (dbo.fnStringAt(@CurrentPosition, @Word, 'DG')=1)
            BEGIN
                            IF (dbo.fnStringAt((@CurrentPosition + 2),@Word,'I,E,Y')=1)
                            BEGIN
                                    --e.g. 'edge'
                    SET @MP1 = @MP1 + 'J'
                    SET @MP2 = @MP2 + 'J'
                                SET @CurrentPosition = @CurrentPosition + 3
                            END
                            ELSE
                BEGIN
                                    --e.g. 'edgar'
                    SET @MP1 = @MP1 + 'TK'
                    SET @MP2 = @MP2 + 'TK'
                                SET @CurrentPosition = @CurrentPosition + 2
                            END
            END
                    ELSE IF (dbo.fnStringAt(@CurrentPosition,@Word,'DT,DD')=1)
                    BEGIN
                SET @MP1 = @MP1 + 'T'
                SET @MP2 = @MP2 + 'T'
                            SET @CurrentPosition = @CurrentPosition + 2
                    END
                    ELSE
            BEGIN
                SET @MP1 = @MP1 + 'T'
                SET @MP2 = @MP2 + 'T'
                            SET @CurrentPosition = @CurrentPosition + 1
            END
        END

        ELSE IF @CurrentChar = 'F'
        BEGIN
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'F')
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 2
            END
                    ELSE
            BEGIN
                            SET @CurrentPosition = @CurrentPosition + 1
            END
            SET @MP1 = @MP1 + 'F'
            SET @MP2 = @MP2 + 'F'
        END

        ELSE IF @CurrentChar = 'G'
        BEGIN
                    IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'H')
                    BEGIN
                            IF (@CurrentPosition > 1) AND 
(dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition - 1,1)) = 0)
                            BEGIN
                    SET @MP1 = @MP1 + 'K'
                    SET @MP2 = @MP2 + 'K'
                                SET @CurrentPosition = @CurrentPosition + 2
                            END
                                --'ghislane', ghiradelli
                                ELSE IF (@CurrentPosition = 1)
                                BEGIN 
                                        IF (SUBSTRING(@Word,@CurrentPosition + 2,1) = 'I')
                    BEGIN
                        SET @MP1 = @MP1 + 'J'
                        SET @MP2 = @MP2 + 'J'
                    END
                                        ELSE
                    BEGIN
                        SET @MP1 = @MP1 + 'K'
                        SET @MP2 = @MP2 + 'K'
                    END
                                SET @CurrentPosition = @CurrentPosition + 2
                            END
                            --Parker's rule (with some further refinements) - e.g., 'hugh'
                            ELSE IF (((@CurrentPosition > 2) AND (dbo.fnStringAt((@CurrentPosition 
- 2),@Word,'B,H,D')=1) )
                                    --e.g., 'bough'
                                    OR ((@CurrentPosition > 3) AND (dbo.fnStringAt((@CurrentPosition 
- 3),@Word,'B,H,D')=1) )
                                    --e.g., 'broughton'
                                    OR ((@CurrentPosition > 4) AND (dbo.fnStringAt((@CurrentPosition 
- 4),@Word,'B,H')=1) ) )
                            BEGIN
                                SET @CurrentPosition = @CurrentPosition + 2
                END
                            ELSE
                BEGIN
                                    --e.g., 'laugh', 'McLaughlin', 'cough', 'gough', 'rough', 'tough'
                                    IF ((@CurrentPosition > 3) 
                                            AND (SUBSTRING(@Word,@CurrentPosition - 1,1) = 'U') 
                                            AND (dbo.fnStringAt((@CurrentPosition - 
3),@Word,'C,G,L,R,T')=1) )
                                    BEGIN
                        SET @MP1 = @MP1 + 'F'
                        SET @MP2 = @MP2 + 'F'
                    END
                                    ELSE
                    BEGIN
                                            IF ((@CurrentPosition > 1) AND 
SUBSTRING(@Word,@CurrentPosition - 1,1) <> 'I')
                        BEGIN
                            SET @MP1 = @MP1 + 'K'
                            SET @MP2 = @MP2 + 'K'
                        END
                    END

                                SET @CurrentPosition = @CurrentPosition + 2
                            END
                    END

                    ELSE IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'N')
                    BEGIN
                            IF ((@CurrentPosition = 2) AND (dbo.fnIsVowel(LEFT(@Word,1))=1) AND 
(dbo.fnSlavoGermanic(@Word)=0))
                            BEGIN
                    SET @MP1 = @MP1 + 'KN'
                    SET @MP2 = @MP2 + 'N'
                END
                            ELSE
                BEGIN
                                    --not e.g. 'cagney'
                                    IF ((dbo.fnStringAt((@CurrentPosition + 2),@Word,'EY')=0) 
                                                    AND (SUBSTRING(@Word,@CurrentPosition + 1,1) <> 
'Y') AND (dbo.fnSlavoGermanic(@Word)=0))

这样做

         create table person(
         personid int identity(1,1) primary key,
         firstname varchar(20),
         lastname varchar(20),
         addressindex int,
         sound varchar(10)
         )

然后创建触发器

         create trigger trigoninsert for dbo.person
         on insert 
         as
         declare @personid int;
         select @personid=personid from inserted;
         update person
         set sound=soundex(firstname) where personid=@personid;

现在我可以做的是创建一个看起来像这样的程序

         create procedure getfuzzi(@personid int)
          as
         declare @sound varchar(10);
         set @sound=(select sound from person where personid=@personid;
         select personid,firstname,lastname,addressindex from person
         where sound=@sound

这将为您返回与特定人物提供的名称几乎匹配的所有名称