MySql查找重復數據並保留一條記錄

查詢重復記錄

select * From 表名 where 重復字段 In (select 重復字段 From 表 Group By 重復字段 Having Count(*) > 1) order by 重復字段 desc

刪除重復數據保留一條

delete from 表名 where id not in (select id from (select min(id) AS id from 表名 group by 重復字段) a )