delete from A where groupid = '1111';
delete from C where exists(select 1 from B where B.setid = C.setid and B.groupid ='1111');
delete from B where groupid = '1111';
delete from C where exists(select 1 from B where B.setid = C.setid and B.groupid ='1111');
delete from B where groupid = '1111';
解决方案 »
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