Question

I have table place contains author_id and table place_user_relation contains columns user_id,place_id

I want to fetch `place.id` where `place_user_relation.user_id=1` or `place.author_id=1`.Problem is this criteria is in two tables. To my knowledge, I wrote a wrong query:

    SELECT r.*,p.* FROM place_user_relation as r
    JOIN place as p
    ON p.place_id=r.place OR p.author_id=1
    WHERE r.user_id=1
    /*I also tried WHERE r.user_id=1 OR p.author_id=1*/

in which contains an OR in ON statement, seems I can’t do that. What’s the right way to do this?

Answer 1

Try this:

SELECT p.id
  FROM place_user_relation r JOIN place p ON p.id = r.place_id
 WHERE p.author_id = 1
    OR r.user_id = 1