Mysql查询某字段值重复的数据
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;
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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;