列同时不能等于某个值（mysql）

Question

我有这张桌子：

+------+----------+-------------+
| id   | category | category_id |
+------+----------+-------------+
|  1   | 2        | 12          |
|  2   | 1        | 12          |
|  3   | 3        | 54          |
|  4   | 3        | 17          |
|  5   | 2        | 14          |
+------+----------+-------------+

我需要得到以下内容：
当category = 2时：category_id！= 12
即

+------+----------+-------------+
| id   | category | category_id |
+------+----------+-------------+
|  2   | 1        | 12          |
|  3   | 3        | 54          |
|  4   | 3        | 17          |
|  5   | 2        | 14          |
+------+----------+-------------+

此代码不起作用：

SELECT * FROM `table` WHERE `category`!=2 AND `category_id`!=12

Answer 1

我想你想要OR：

select *
from `table`
where `category` != 2
    or `category_id` != 12

根据De Morgan's law，与：

相同

select *
from `table`
where not (
        `category` = 2
        and `category_id` = 12
        )

读取 - 获取所有行，除非类别为2且category_id为一行中的12