SQL update
UPDATE A
SET (A1, A2, A3) = (SELECT B1, B2, B3 FROM B WHERE A.ID = B.ID)
update tb2 set (fv2) = (SELECT fv2+fv1 from tb1 where tb2.fid=tb1.fid and fv1>5)
where exists (SELECT fv2+fv1 from tb1 where tb2.fid=tb1.fid and fv1>5)
update tb2 set (fv2) =CASE WHEN (SELECT fv2+fv1 from tb1 where tb2.fid=tb1.fid and fv1>5) IS NULL THEN fv2 ELSE (SELECT fv2+fv1 from tb1 where tb2.fid=tb1.fid and fv1>5) END
根据另一个表的对应记录的某个字段的值,更新一个表的对应记录的某个字段。
如
tb1
fid fv1
1 6
2 3
3 4
4 7
tb2
fid fv2
1 5
3 9
2 2
4 1
希望得到:
tb2
fid fv2
1 11 (加了6)
3 9 (不加)
2 2 (不加)
4 8 (加了7)
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转载自gong-10140.iteye.com/blog/1593891
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