我有一个MySQL数据库并在phpmyadmin中运行sql。根据2个电子邮件地址查找列的重复条目
我正在尝试为列venID查找重复条目。重复venID只有2个电子邮件地址 - [email protected]和[email protected]。
这是我迄今为止，但我需要添加我想比较的电子邮件地址。不知道该怎么做。不知道我有甚么好的开始。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
试试这个：
SELECT venID, email, count(*) as dupCount
FROM thetable, thetable2
WHERE email in ('[email protected]','[email protected]')
GROUP BY venID, email
HAVING count(*) > 1
如果你也只需要选择特定的venID，您可以使用此：
SELECT venID, email, count(*) as dupCount
FROM thetable, thetable2
WHERE email in ('[email protected]','[email protected]')
AND venID = 2
GROUP BY venID, email
HAVING count(*) > 1
见https://meta.stackoverflow.com/问题/ 333952 /为什么，应该-I-提供-AN-MCVE换什么，似乎对我将要-A-极简单的SQL查询 – Strawberry