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;
链接到文章: https://vpsum.com/46485.html
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;链接到文章: https://vpsum.com/46485.html