How to make a correct query in the database?

Question

MySQL

Actually:

$result = $db->query( "SELECT * FROM ".PREFIX."_stol_post WHERE id='{$fort1}'" );

I have 3 tables - fort1, fort2, fort3 in one of them the correct ID at which posts are displayed, how to make sure that he immediately checked for all three at once.

Answer 1

Use UNION .