update A set ab=(select B.name from A,B where A.ab=1 and A.ss=B.ss) where ab=1;求解
表A 表B
aa ss ab aa ss name
12 11 1 12 11 100
就是表A和表B,若表B中aa和ss列和表A的aa和ss列相同,更新表A.ab=B.name
表A 表B
aa ss ab aa ss name
12 11 1 12 11 100
就是表A和表B,若表B中aa和ss列和表A的aa和ss列相同,更新表A.ab=B.name
set a.ab=b.name
where a.ab=1
'截至2011-03-14 20:33:42 用户结帖率0.00%
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where a.aa=b.aa and a.ss=b.ss and a.ab=1