How to make double condition in SQL query?

Question

PHP

When creating a blog site, I ran into a problem.
I can't figure out how to make a double condition in a SQL query,
here's the code:

SELECT * FROM `comics` WHERE `categories_id` = '17' OR `categories_id_2` = '17' OR `categories_id_3` = '17' OR `categories_id_4` = '17' OR `categories_id_5` = '17' OR `categories_id_6` = '17' OR `categories_id_7` = '17' OR `categories_id_8` = '17' AND `categories_id` = '1' OR `categories_id_2` = '1' OR `categories_id_3` = '1' OR `categories_id_4` = '1' OR `categories_id_5` = '1' OR `categories_id_6` = '1' OR `categories_id_7` = '1' OR `categories_id_8` = '1' ORDER BY `id` DESC

Result:

But the problem is that I only need articles with two categories:

How can this be solved, or should I just cut off the extra ones in PHP?

Answer 1

Esteem that such the third normal form and that such communications.
You need to put the categories in a separate table and implement a many-to-many relationship. When you do this, your question will disappear by itself)