MsSql去掉重复记录

假如有这样一张表news：字段：id,title,time,image,author，现在表中有1万多条记录，其中title重复的有上千条。如何才能一次性将title重复记录删除呢？

ID	Title	Time	image	author
1	我是高富帅	1234	pic1.jpg	1
2	我是白富美	1233	pic2.jpg	2
3	我是高富帅	1235	pic3.jpg	3

本人使用sqlserver数据库。

现在先将所有的重复数据显示出来：

SELECT id,title,time,image,author

FROM  news

WHERE (title IN (SELECT title FROM news GROUP BY title HAVING (COUNT(title) > 1))) 

删除多余的记录

delete from news

WHERE (title IN (SELECT title FROM news GROUP BY title HAVING (COUNT(title) > 1)))

AND  (id NOT IN (SELECT MIN(id) AS nid FROM news GROUP BY title HAVING (COUNT(title) > 1)))

使用min的原因是保留发布时间最早的记录，如果要保留时间最后发布的可以使用max

转载于:https://www.cnblogs.com/gkstk/p/10486991.html