Mysql僅選擇唯一的行（僅出現一次）

Question

考慮表中的以下數據->

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內容：

2   example12@hotmail.com

...並跳過重復的值。

Answer 1

您想要的查詢是

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

Answer 2

通過電子郵件分組並添加計數（電子郵件）= 1