假如有這樣一張表news：字段：id,title,time,image,author，現在表中有1萬多條記錄，其中title重復的有上千條。如何才能一次性將title重復記錄刪除呢？
| ID | Title | Time | image | author |
| 1 | 我是高富帥 | 1234 | pic1.jpg | 1 |
| 2 | 我是白富美 | 1233 | pic2.jpg | 2 |
| 3 | 我是高富帥 | 1235 | pic3.jpg | 3 |
本人使用sqlserver數據庫。
現在先將所有的重復數據顯示出來：
SELECT id,title,time,image,author FROM news WHERE (title IN (SELECT title FROM news GROUP BY title HAVING (COUNT(title) > 1)))
刪除多余的記錄
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的原因是保留發布時間最早的記錄，如果要保留時間最后發布的可以使用max