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update YF_MZFYZD set jjje=tbl.jjje from (select a.xh,sum(b.jjje) jjje from YF_MZFYZD a(nolock),YF_MZFYMX b(nolock)
where a.xh=b.fyxh group by a.xh) tbl,YF_MZFYZD x where tbl.xh=x.xh and isnull(x.jjje,0)=0
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原文地址：http://www.cnblogs.com/kaiwanlin/p/4201064.html
