案例
![](https://img.laitimes.com/img/_0nNw4CM6IyYiwiM6ICdiwiIn5GcuMTZzEWZxEzYyYmZjFmZ4MDN4UWOhZWZhRTMmdDZ2kTYfdWbp9CXt92Yu4GZjlGbh5SZslmZxl3Lc9CX6MHc0RHaiojIsJye.png)
same.png
語句
查找相同的資料
SELECT *
FROM Test.dbo.test a
WHERE EXISTS ( SELECT *
FROM Test.dbo.test
WHERE a.name=name
GROUP BY name ,dep
HAVING COUNT(*) > 1 );
去重方法
DELETE FROM Test.dbo.Test
WHERE ID NOT IN ( SELECT MIN(ID)
FROM Test.dbo.Test
GROUP BY Name ,Dep );
OR
DELETE
FROM Test.dbo.Test
WHERE ID NOT IN ( SELECT MAX(ID)
FROM Test.dbo.Test
GROUP BY Name ,Dep )