About oracle10g The updated statement used in the Library to guide data----ZT

Source: Internet
Author: User

两种方法: -- 方法1. UPDATE 表2 SET    表2.C  =  ( SELECT B   FROM 表1   WHERE 表1.A = 表2.A) WHERE    EXISTS (  SELECT FROM 表1   WHERE 表1.A = 表2.A)    -- 方法2 MERGE  INTO 表2  USING 表1 ON ( 表2.A = 表1.A )     -- 条件是 A 相同 WHEN MATCHED  THEN UPDATE SET 表2.C = 表1.B    -- 匹配的时候,更新

About oracle10g The updated statement used in the Library to guide data----ZT

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