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UPDATE cwhd,cwsj
SET cwhd.井号 = cwsj.井号, cwhd.X = cwsj.x, cwhd.Y = cwsj.y,cwhd.高位1 = [cwsj].[mfs1]-[cwsj].[T6]
WHERE cwhd.ID=cwsj.ID
SET cwhd.湖扩1 = [cwsj].[ffs1]-[cwsj].[mfs1] WHERE [cwsj].[mfs1] <> NULL
SET cwhd.湖扩1 = [cwsj].[ffs1]-[cwsj].[T6] WHERE [cwsj].[mfs1] is NULL;
SET cwhd.低位1 = [cwsj].[xT6]-[cwsj].[ffs1] WHERE [cwsj].[ffs1] <> NULL
SET cwhd.低位1 = [cwsj].[xT6]-[cwsj].[mfs1] WHERE [cwsj].[ffs1] is NULL;
SET cwhd.高位2 = [cwsj].[mfs2]-[cwsj].[xT6] WHERE [cwsj].[xT6] <> NULL
SET cwhd.高位2 = [cwsj].[mfs2]-[cwsj].[mfs1] WHERE [cwsj].[xT6] is NULL;
SET cwhd.湖扩2 = [cwsj].[ffs2]-[cwsj].[mfs2] WHERE [cwsj].[mfs2] <> NULL
SET cwhd.湖扩2 = [cwsj].[ffs2]-[cwsj].[xT6] WHERE [cwsj].[mfs2] is NULL;
SET cwhd.低位2 = [cwsj].[xT7]-[cwsj].[ffs2] WHERE [cwsj].[ffs2] <> NULL
SET cwhd.低位2 = [cwsj].[xT7]-[cwsj].[mfs2] WHERE [cwsj].[ffs2] is NULL;
请高手解释下~
谢谢!