https://stackoverflow.com/questions/2334712/how-do-i-update-from-a-select-in-sql-server
UPDATE Table_A SET Table_A.col1 = Table_B.col1, Table_A.col2 = Table_B.col2 FROM Some_Table AS Table_A INNER JOIN Other_Table AS Table_B ON Table_A.id = Table_B.id WHERE Table_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 A SET 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 A SET A.NAME = B.NAME FROM TableNameA A INNER JOIN TableName B ON A.ID = B.ID
总结
UPDATE a SET a.CustomTableItemID = b.CustomTableItemID FROM @TempTable AS a INNER JOIN dbo.tbm_cti_CustomTableItem AS b ON a.CustomTableItemGUID = b.CustomTableItemGUID;