我的代码使用一个Source
更改的Destination
表和一个必须与这些更改匹配的表。
--
-- Sample SQL to update only rows in a "Destination" Table
-- based on only rows that have changed in a "Source" table
--
--
-- Drop and Create a Temp Table to use as the "Source" Table
--
IF OBJECT_ID('tempdb..#tSource') IS NOT NULL drop table #tSource
create table #tSource (Col1 int, Col2 int, Col3 int, Col4 int)
--
-- Insert some values into the source
--
Insert #tSource (Col1, Col2, Col3, Col4) Values(1,1,1,1)
Insert #tSource (Col1, Col2, Col3, Col4) Values(2,1,1,2)
Insert #tSource (Col1, Col2, Col3, Col4) Values(3,1,1,3)
Insert #tSource (Col1, Col2, Col3, Col4) Values(4,1,1,4)
Insert #tSource (Col1, Col2, Col3, Col4) Values(5,1,1,5)
Insert #tSource (Col1, Col2, Col3, Col4) Values(6,1,1,6)
--
-- Drop and Create a Temp Table to use as the "Destination" Table
--
IF OBJECT_ID('tempdb..#tDest') IS NOT NULL drop Table #tDest
create table #tDest (Col1 int, Col2 int, Col3 int, Col4 int)
--
-- Add all Rows from the Source to the Destination
--
Insert #tDest
Select Col1, Col2, Col3, Col4 from #tSource
--
-- Look at both tables to see that they are the same
--
select *
from #tSource
Select *
from #tDest
--
-- Make some changes to the Source
--
update #tSource
Set Col3=19
Where Col1=1
update #tSource
Set Col3=29
Where Col1=2
update #tSource
Set Col2=38
Where Col1=3
update #tSource
Set Col2=48
Where Col1=4
--
-- Look at the Differences
-- Note: Only 4 rows are different. 2 Rows have remained the same.
--
Select Col1, Col2, Col3, Col4
from #tSource
except
Select Col1, Col2, Col3, Col4
from #tDest
--
-- Update only the rows that have changed
-- Note: I am using Col1 like an ID column
--
Update #tDest
Set Col2=S.Col2,
Col3=S.Col3,
Col4=S.Col4
From ( Select Col1, Col2, Col3, Col4
from #tSource
except
Select Col1, Col2, Col3, Col4
from #tDest
) S
Where #tDest.Col1=S.Col1
--
-- Look at the tables again to see that
-- the destination table has changed to match
-- the source table.
select *
from #tSource
Select *
from #tDest
--
-- Clean Up
--
drop table #tSource
drop table #tDest