方法1

https://stackoverflow.com/questions/2334712/how-do-i-update-from-a-select-in-sql-server

UPDATETable_A
SETTable_A.col1 = Table_B.col1,Table_A.col2 = Table_B.col2
FROMSome_Table AS Table_AINNER JOIN Other_Table AS Table_BON Table_A.id = Table_B.id
WHERETable_A.col3 = 'cool'

方法2

https://stackoverflow.com/questions/1068447/update-with-two-tables

Your query does not work because you have no FROM clause that specifies the tables you are aliasing via A/B.

Please try using the following:

UPDATE ASET A.NAME = B.NAME
FROM TableNameA A, TableNameB B
WHERE A.ID = B.ID

Personally I prefer to use more explicit join syntax for clarity i.e.

UPDATE ASET A.NAME = B.NAME
FROM TableNameA AINNER JOIN TableName B ON A.ID = B.ID

总结

  UPDATE aSET    a.CustomTableItemID = b.CustomTableItemIDFROM   @TempTable AS aINNER JOIN dbo.tbm_cti_CustomTableItem AS b ON a.CustomTableItemGUID = b.CustomTableItemGUID;

转载于:https://www.cnblogs.com/chucklu/p/8075336.html

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How do I UPDATE from a SELECT in SQL Server?

方法1

方法2

总结

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