Question

我想从单个表中选择单个列中的所有重复记录。我使用了以下代码。但是我只能获得一个重复记录。代码如下所示

SELECT Datetime COUNT(*)FROM  users GROUP BY Datetime HAVING  COUNT(*) > 1

但我想要像下表那样的结果

TableName:MyTable
DateTime
04/16/2015
04/16/2015
04/16/2015
04/16/2015

但我的查询如下所示。

DateTime
 04/16/2015 count(4)

请帮助我

Answer 1

Join回到原始数据;

SELECT u.*
FROM users u JOIN
     (SELECT Datetime
      FROM users
      GROUP BY Datetime
      HAVING  COUNT(*) > 1
     ) d
     ON u.Datetime = d.Datetime;

Answer 2

Select Datetime from Users
where Datetime in 
          (SELECT Datetime FROM  users GROUP BY Datetime HAVING  COUNT(*) > 1)

如何在SQl中的单个表中选择所有重复记录

2 个答案: