标签：备份 root .sql style www. purge post class blog
查询user表中，user_name字段值重复的数据及重复次数
select user_name,count(*) as count from user group by user_name having count>1;
标签：备份 root .sql style www. purge post class blog
原文地址：http://www.cnblogs.com/kccdzz/p/7735485.html
