mysql query not returning desired results

Question

I have three tables I am trying to pull results from but am turning up empty handed. Here is my query:

SELECT f . *, o . *, u.username, COUNT (o.order_id) as cnt 
FROM products f, orders o, users u 
WHERE f.product_id=o.product_id 
AND f.user_id = u.id 
AND (f.title LIKE '%hlt%' OR f.description LIKE '%hlt%' OR u.username LIKE '%hlt%') 
LIMIT 5

this is returning no results although there is definitely records that meet this criteria (although apparently not as I have it written).

Answer 1

You used COUNT (o.order_id) with out group BY .This is causing the problem.You can not execute this query with out using GROUP BY

GROUP BY

Answer 2

You need to use joins when pulling data from multiple tables. Your query should be:

SELECT f . *, o . *, u.username, COUNT (o.order_id) as cnt 
FROM products f
JOIN orders o ON f.product_id=o.product_id
JOIN users u ON f.user_id = u.id 
WHERE (f.title LIKE '%hlt%' OR f.description LIKE '%hlt%' OR u.username LIKE '%hlt%') 
LIMIT 5