xiaolongren: 这个。 [阅读: 385] 2004-12-24 05:50:34 update tbl set yue=vt.js-vt.ds from ( select a.id,sum(b.jie) as js,sum(b.dai) as ds from tbl a,tbl b where b.date<=a.date group by a.id )as vt where vt.id=tbl.id 吃点、喝点比啥都强!