sql update set 子查询返回多于一行. updateASET(XM1,ZH1,ZW1)=(SELECTXM,ZH,ZWFROMBWHEREA.XM=B.XM,A.ZH=B.ZH)WHEREEXISTS(SELECT1FROMWHEREA.XM=B.XM,A.ZH=B.ZH,A)A ...
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