我需要运行一个 select 语句,该语句返回列值不重复的所有行(例如 EmailAddress)。
例如,如果表格如下所示:
CustomerName EmailAddress
Aaron aaron@gmail.com
Christy aaron@gmail.com
Jason jason@gmail.com
Eric eric@gmail.com
John aaron@gmail.com
我需要返回查询:
Aaron aaron@gmail.com
Christy aaron@gmail.com
John aaron@gmail.com
我读了很多帖子并尝试了不同的查询但无济于事。我认为应该有效的查询如下。有人可以提出替代方案或告诉我我的查询可能有什么问题吗?
select EmailAddress, CustomerName from Customers
group by EmailAddress, CustomerName
having COUNT(distinct(EmailAddress)) > 1
最佳答案
这比 EXISTS
方式快得多:
SELECT [EmailAddress], [CustomerName] FROM [Customers] WHERE [EmailAddress] IN
(SELECT [EmailAddress] FROM [Customers] GROUP BY [EmailAddress] HAVING COUNT(*) > 1)
关于sql - 如何选择列值不不同的每一行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13146304/