用一张表回更新另一张表

用一张表来更新另一张表

经典语句：UPDATE TABLE1 SET (A, B, C) = (SELECT A, B, C FROM TABLE2)

?ORACLE：可以用MERGE语句(oracle 10g或以上),它是update和insert的组合.

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MERGE INTO TABLE1 A

　USING TABLE2 B
　　ON (A.OBJECT_ID = B.OBJECT_ID)
　WHEN MATCHED THEN
　　UPDATE SET A.STATUS = B.STATUS
　WHEN NOT MATCHED THEN
　　INSERT (OBJECT_ID, STATUS) VALUES (B.OBJECT_ID, B.STATUS)

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