Question

我有以下使用成员资格表和用户表的查询。我喜欢做的是对于有计数（*）＆gt;的电子邮件。 1，我也想显示UserName。

 SELECT au.UserName, am.Email       
 FROM [dbo].[aspnet_Membership] am
 join aspnet_Users au
 on am.UserId = au.UserId
 group by am.Email
 having count(*) > 1
 order by email

不确定怎么做。我尝试使用max（au.UserName），但这只会给我第一个用户名而不是全部用户名

Answer 1

只需将au.UserName添加到group by子句中即可。

group by au.UserName, am.Email

Answer 2

使用count窗口函数。

select userName,Email
from (SELECT au.UserName,am.Email, count(*) over(partition by am.Email) as cnt_per_email       
      FROM [dbo].[aspnet_Membership] am
      join aspnet_Users au on am.UserId = au.UserId
     ) t
where cnt_per_email>1

Answer 3

您可以将IN与子查询一起使用。

SELECT 
    au.UserName, 
    am.Email       
FROM 
    [dbo].[aspnet_Membership] am
    join aspnet_Users au
    on am.UserId = au.UserId
where
     am.Email in (select Email from [aspnet_Membership] group by Email having count(*) > 1)

得数（*）＆gt; 1个字段值

3 个答案: