mysql - PHP数据库查询疑问

Question

有一个文章表，文章表中有个关联标签的字段tag
tag字段的内容基本是这样的：1,2,3,333,230（关联的标签ID，用逗号隔开)
现在出现问题了，我现在想找到标签ID为3的文章，用LIKE %3%好像会把333,230标签的内容都查出来
在不改变表结构的情况下，有什么查询方法吗？

Answer 1

SELECT * FROM test WHERE find_in_set('3',tag)

Answer 2

tag LIKE '%,3' or tag LIKE '3,%' or tag LIKE '%,3,%'

Answer 3

LIKE %,3,% just add a comma

Answer 4

find_in_set, use this to meet your requirements, don’t use like....

Answer 5

I recommend using another table to maintain the classification relationship. find_in_set is a full table scan without using indexes. There will be problems with the database by then