MySQL - Counting number by ID

Question

Let's say I have this database (as an example)

Anyways, I want to make a "most liked" question section but the "likes" are in a different database table hence the likes . Anyways, I have the id of the question being the same thing in question_id ... but.. how do I count them in a MYSQL query?

Thanks.

Answer 1

What about using an inner join between your tables, and a group by on the question's ids:

select question.id, question.question_title, count(*) as num_likes
from question
    inner join likes on likes.question_id = question.id
group by question.id
order by count(*) desc
limit 0, 10

This should get you the 10 most-liked questions, with, for each one of those, the number of times it's been liked.

Answer 2

SELECT x.id,x.question_title,x.desc,x.category,COUNT(*) AS likes FROM question x LEFT JOIN likes y ON x.id=y.question_id GROUP BY x.id,x.question_title,x.desc,x.category ORDER BY COUNT(*) DESC