php仅在剂量具有重复值时从mysql获取记录

Question

像那样的mysql

console.log('intersection', _.intersection(arr1, arr2));

我的预期结果是

=======================
| id    |  name       |
| 1     | jhon        |  
| 2     | sarah       |
| 3     | suzan       |
| 4     | jhon        |
| 5     | ahmed       |
=======================

要删除sarah suszan ahmed 或重复任何值名称 我试着用

jhon

但它只显示重复的值

Answer 1

使用HAVING

SELECT `name` FROM `table` GROUP BY `name` HAVING COUNT(`name`) = 1

Answer 2

要获得唯一值，您可以使用以下内容：

//这将返回唯一值

SELECT DISTINCT `name` FROM `table`;