在php / mysql中的sql查询中有多个类别和一个帖子

Question

I Made two tables

1. posts
2. categories

In posts table I created category column, here I store multiple category_id like this 1,2,3 .

The problem is if category column has single category_id like 1 or 2 or 3 , I can easily query the data like this:

SELECT title FROM posts WHERE category = $category_id

However, I am unsure as to how to query the comma-delimited data. Is there a way to do this, or should I change the table structure ?

Answer 1

您可以创建一个联结表（可能使用EAV设计 ），也可以保留唯一的表并使用FIND_IN_SET ，如下所示：

SELECT title FROM posts WHERE FIND_IN_SET(1, category) > 0

Answer 2

Here you can have: Categoryid: 1 Postid: 1,2,3

Result = Categoryid: 1 --> Postid 1,2,3