删除所有名称以特定字符串开头的表

如何删除所有名称以给定字符串开头的表？

我认为可以通过一些动态SQL和INFORMATION_SCHEMA表来完成。

如果数据库中有多个所有者，则可能需要修改查询以包括所有者。

DECLARE @cmd varchar(4000)
DECLARE cmds CURSOR FOR
SELECT 'drop table [' + Table_Name + ']'
FROM INFORMATION_SCHEMA.TABLES
WHERE Table_Name LIKE 'prefix%'

OPEN cmds
WHILE 1 = 1
BEGIN
    FETCH cmds INTO @cmd
    IF @@fetch_status != 0 BREAK
    EXEC(@cmd)
END
CLOSE cmds;
DEALLOCATE cmds

这比使用生成脚本加运行的两步方法要干净。但是，脚本生成的一个优点是，它使您有机会在实际运行之前检查所有要运行的内容。

我知道，如果要针对生产数据库执行此操作，请尽可能小心。

编辑代码示例已修复。

SELECT 'DROP TABLE "' + TABLE_NAME + '"' 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '[prefix]%'

这将生成一个脚本。

添加子句以在删除之前检查表是否存在：

SELECT 'IF OBJECT_ID(''' +TABLE_NAME + ''') IS NOT NULL BEGIN DROP TABLE [' + TABLE_NAME + '] END;' 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '[prefix]%'

这将使您获得按外键顺序排列的表，并避免删除某些由SQL Server创建的表。该t.Ordinal值会将表切成依赖关系层。

WITH TablesCTE(SchemaName, TableName, TableID, Ordinal) AS
(
    SELECT OBJECT_SCHEMA_NAME(so.object_id) AS SchemaName,
        OBJECT_NAME(so.object_id) AS TableName,
        so.object_id AS TableID,
        0 AS Ordinal
    FROM sys.objects AS so
    WHERE so.type = 'U'
        AND so.is_ms_Shipped = 0
        AND OBJECT_NAME(so.object_id)
        LIKE 'MyPrefix%'

    UNION ALL
    SELECT OBJECT_SCHEMA_NAME(so.object_id) AS SchemaName,
        OBJECT_NAME(so.object_id) AS TableName,
        so.object_id AS TableID,
        tt.Ordinal + 1 AS Ordinal
    FROM sys.objects AS so
        INNER JOIN sys.foreign_keys AS f
            ON f.parent_object_id = so.object_id
                AND f.parent_object_id != f.referenced_object_id
        INNER JOIN TablesCTE AS tt
            ON f.referenced_object_id = tt.TableID
    WHERE so.type = 'U'
        AND so.is_ms_Shipped = 0
        AND OBJECT_NAME(so.object_id)
        LIKE 'MyPrefix%'
)
SELECT DISTINCT t.Ordinal, t.SchemaName, t.TableName, t.TableID
FROM TablesCTE AS t
    INNER JOIN
    (
        SELECT
            itt.SchemaName AS SchemaName,
            itt.TableName AS TableName,
            itt.TableID AS TableID,
            Max(itt.Ordinal) AS Ordinal
        FROM TablesCTE AS itt
        GROUP BY itt.SchemaName, itt.TableName, itt.TableID
    ) AS tt
        ON t.TableID = tt.TableID
            AND t.Ordinal = tt.Ordinal
ORDER BY t.Ordinal DESC, t.TableName ASC

在Oracle XE上，这有效：

SELECT 'DROP TABLE "' || TABLE_NAME || '";'
FROM USER_TABLES
WHERE TABLE_NAME LIKE 'YOURTABLEPREFIX%'

或者，如果您想消除约束并释放空间，请使用以下命令：

SELECT 'DROP TABLE "' || TABLE_NAME || '" cascade constraints PURGE;'
FROM USER_TABLES
WHERE TABLE_NAME LIKE 'YOURTABLEPREFIX%'

这将产生一堆 DROP TABLE cascade constraints PURGE语句...

为此VIEWS使用：

SELECT 'DROP VIEW "' || VIEW_NAME || '";'
FROM USER_VIEWS
WHERE VIEW_NAME LIKE 'YOURVIEWPREFIX%'

我在寻找mysql语句以基于@Xenph Yan删除所有WordPress表时看到了这篇文章，这是我最终要做的事情：

SELECT CONCAT(  'DROP TABLE `', TABLE_NAME,  '`;' ) AS query
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE  'wp_%'

这将为您提供所有表以wp_开头的放置查询集

这是我的解决方案：

SELECT CONCAT('DROP TABLE `', TABLE_NAME,'`;') 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE 'TABLE_PREFIX_GOES_HERE%';

当然，您需要替换TABLE_PREFIX_GOES_HERE为前缀。

EXEC sp_MSforeachtable 'if PARSENAME("?",1) like ''%CertainString%'' DROP TABLE ?'

编辑：

sp_MSforeachtable是未记录的，因此不适合生产，因为它的行为可能因MS_SQL版本而异。

CREATE PROCEDURE usp_GenerateDROP
    @Pattern AS varchar(255)
    ,@PrintQuery AS bit
    ,@ExecQuery AS bit
AS
BEGIN
    DECLARE @sql AS varchar(max)

    SELECT @sql = COALESCE(@sql, '') + 'DROP TABLE [' + TABLE_NAME + ']' + CHAR(13) + CHAR(10)
    FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_NAME LIKE @Pattern

    IF @PrintQuery = 1 PRINT @sql
    IF @ExecQuery = 1 EXEC (@sql)
END

Xenph Yan的答案比我的答案干净得多，但这里的答案完全一样。

DECLARE @startStr AS Varchar (20)
SET @startStr = 'tableName'

DECLARE @startStrLen AS int
SELECT @startStrLen = LEN(@startStr)

SELECT 'DROP TABLE ' + name FROM sysobjects
WHERE type = 'U' AND LEFT(name, @startStrLen) = @startStr

只需更改tableName为您要搜索的字符。

这对我有用。

DECLARE @sql NVARCHAR(MAX) = N'';

SELECT @sql += '
DROP TABLE ' 
    + QUOTENAME(s.name)
    + '.' + QUOTENAME(t.name) + ';'
    FROM sys.tables AS t
    INNER JOIN sys.schemas AS s
    ON t.[schema_id] = s.[schema_id] 
    WHERE t.name LIKE 'something%';

PRINT @sql;
-- EXEC sp_executesql @sql;

select 'DROP TABLE ' + name from sysobjects
where type = 'U' and sysobjects.name like '%test%'

-测试是表名

SELECT 'if object_id(''' + TABLE_NAME + ''') is not null begin drop table "' + TABLE_NAME + '" end;' 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '[prefix]%'

我不得不怀疑Xenph Yan的答案，因为我的表不在默认模式中，所以我不得不对其做些微推导。

SELECT 'DROP TABLE Databasename.schema.' + TABLE_NAME 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE 'strmatch%'

如果是临时表，您可能需要尝试

SELECT 'DROP TABLE "' + t.name + '"' 
FROM tempdb.sys.tables t
WHERE t.name LIKE '[prefix]%'