如何从一列获取唯一数据？

Question

假设我有以下专栏：

+------+
| id   |
+------+
|1500  | 
|1500  |
|1600  |
|1700  |
|1700  |
|1700  |
|1800  | 
+------+

我的问题是我只想显示列中显示的ID一次，怎么做？

结果将是1600＆amp; 1800

Answer 1

SELECT ID FROM YourTable
GROUP BY ID 
Having Count(*) = 1

试试上面的

Answer 2

select id  from tablename
group by id
Having Count(id) = 1