方法1：
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update table1 set field1=table2.field1 from table2where table1.id=table2.id |
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--简写update t1 set t1.c2 = t2.c2 from t2 where t1.c1 = t2.c1 |
方法2：
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update table1set field1=(select top 1 field1 from table2 where table2.id=table1.id)where table1.id in (condition) |