SQL Server重复检查

Question

确定SQL Server表中重复记录的最佳方法是什么？

例如,我想查找表中收到的最后一个重复的电子邮件(表包含主键,接收日期和电子邮件字段).

样本数据:

1  01/01/2008 stuff@stuff.com
2  02/01/2008 stuff@stuff.com
3  01/12/2008 noone@stuff.com

Answer 1

这样的事情

select email ,max(receiveddate) as MaxDate
from YourTable
group by email 
having count(email) > 1