关于排重的方法
--查重SELECT t.aa1,t.aa2,t.aa4,t.aa5,COUNT(*) FROM tb_a t GROUP BY t.aa1,t.aa2,t.aa4,t.aa5 HAVING COUNT(*) > 1;SELECT * FROM tb_a WHERE (aa1, aa2, aa4, aa5) IN  ...
注册时间:2010-10-20