mysql - 根据 2 个电子邮件地址查找列的重复条目

Question

我有一个 MySQL 数据库并在 phpmyadmin 中运行 sql。

我正在尝试查找 venID 列的重复条目。仅 2 个电子邮件地址的重复 venID - e1@myemail.com 和 e2@myemail.com。

这是我到目前为止所拥有的，但我需要添加我想要比较的电子邮件地址。不知道该怎么做。不确定我所拥有的是否是一个好的开始。有人可以帮忙吗？

SELECT venID, email, count(*) as dupCount  
FROM thetable, thetable2 
WHERE venID and email 
GROUP BY venID, email HAVING count(*) > 1

Answer 1

试试这个:

SELECT venID, email, count(*) as dupCount  
FROM thetable, thetable2 
WHERE email in ('e1@myemail.com','e2@myemail.com') 
GROUP BY venID, email 
HAVING count(*) > 1

如果您也想仅选择特定的 venID，则可以使用以下命令:

SELECT venID, email, count(*) as dupCount  
FROM thetable, thetable2 
WHERE email in ('e1@myemail.com','e2@myemail.com') 
    AND venID = 2
GROUP BY venID, email 
HAVING count(*) > 1