Mysql仅选择唯一的行（仅出现一次）

Question

考虑表中的以下数据->

1   example@hotmail.com
2   example12@hotmail.com
3   example@hotmail.com
4   example@hotmail.com

我希望它只返回以下内容：

2   example12@hotmail.com

...并跳过重复的值。

Answer 1

您想要的查询是

SELECT id, email, whatEverColumn 
FROM table 
WHERE email IN (SELECT email 
               FROM table 
               GROUP BY email 
               HAVING COUNT(id) = 1)

Answer 2

通过电子邮件分组并添加计数（电子邮件）= 1