mysql - 删除除一条记录之外的所有重复记录

Question

我想从表中删除除一条记录 (tbl_user_points) 之外的所有重复记录

表格数据

id  userid  points  Reason
------------------------------
132 1278    50  Bonus points
153 1278    50  Bonus points
174 1278    50  Bonus points
195 1278    50  Bonus points

所以我的最终输出将是

id  userid  points  Reason
------------------------------
132 1278    50  Bonus points

请帮我解决这个问题

Answer 1

试试这个

   Delete
       t1
    FROM 
       tTable t1, tTable t2 
    WHERE 
       t1.userid  = t2.userid  AND 
       t1.points  = t2.points  AND 
       t1.Reason  = t2.Reason AND 
       t1.id < t2.id

(或)

这将始终保留 ID 最小的行 -

  DELETE t2
    FROM `table` t1
    INNER JOIN `table` t2
        ON t1.userid  = t2.userid  AND 
           t1.points  = t2.points  AND 
           t1.Reason  = t2.Reason AND 
           t1.id < t2.id