SQL 删除重复记录,只留ID最小的那条记录
查询语句是:
select * from cj_yonghu a join (
select userName,idCard from cj_yonghu
group by userName,idCard
having count(*)>1) b on a.userName=b.userName and a.idCard=b.idCard order by a.idCard ,a.userName
我现在想把这个变成 删除语句
比如有两条重复记录,删除一条,留一条。。。