从某些类别中选择

Question

我有5个类别的数据库，我试图显示其中4个。基本上我不想显示表中有category=1的行。这是我尝试

SELECT * FROM posts WHERE category IN (2, 7, 8, 9) ORDER BY RAND() 

，但仍显示行（项目），这是从类别1.

Answer 1

我相信问题在别的地方。为确保它不提取类别为1的记录，可以在where子句中添加一个条件。

SELECT * 
FROM posts 
WHERE category <> 1 
    AND category IN (2, 7, 8, 9) 
ORDER BY RAND() 

Answer 2

SELECT * FROM posts WHERE category IN (2, 7, 8, 9) ORDER BY RAND() 

尝试添加类！= 1到你的查询

SELECT * FROM posts WHERE category != 1 and category IN (2, 7, 8, 9) ORDER BY RAND() 

您可以从排除类别1的帖子中选择所有类别

SELECT * FROM posts WHERE category != 1 

Answer 3

下面指定将返回所有类别，除了 类别查询1

SELECT * FROM posts WHERE category NOT IN (1)