标签：count sele sel code rom 查询 table amp tab
SELECT column_a,column_b,COUNT(*) as num FROM TABLE GROUP BY column_a,column_b;
SELECT column_a,column_b,COUNT(*) as num FROM TABLE group by column_a,column_b having count(*)>1;标签：count sele sel code rom 查询 table amp tab
原文地址：http://blog.51cto.com/13523022/2064563
