How do I join 4 tables on mysql select statement?

Question

I have 4 tables in MySQL to join. Example

$select = $db->query(\"SELECT * 
                        FROM ads 
                       WHERE ad_pic=\'1\' 
               


        

Answer 1

SELECT *
FROM ads AS a
LEFT JOIN images AS i ON i.img_ads_id = a.ad_id AND i.img_status = 1
LEFT JOIN users AS u ON u.id = a.ad_userid AND u.user_status = 1
LEFT JOIN category AS c ON c.cat_slug = a.ad_category
WHERE a.ad_pic = 1
AND a.ad_status = 1
ORDER BY a.ad_id DESC
LIMIT 0,4

If an ad must have an image, user, or category, you may use a JOIN instead of a LEFT JOIN. If an ad can have more than one image, user, or category, you will need a more complex query.