mysql - 删除mysql上的重复记录？

Question

我有这个 mysql 查询，可以找到每个主题的重复项和出现次数:

SELECT name, 
 COUNT(name) AS NumOccurrences
FROM topics
GROUP BY name
HAVING ( COUNT(name) > 1 )

但我想做的是删除找到的所有重复项。我只想为每个主题取一个唯一的名称，不要重复!!谢谢

Answer 1

DELETE  t2
FROM    topics t1
JOIN    topics t2
ON      t2.name = t1.name
        AND t2.id < t1.id