MySQL Find the total amount of posts per user

Question

I have a Database with the following two tables, USERS, POSTS I am looking for a way to get the count of how many posts a user has.

Users            P         


        

Answer 1

select users.*, count(posts.user_id)

from users, posts
where users.user_id = posts.user_id
group by posts.user_id

But the best way is too add a field to the users table and keep the amount of posts made by each users, and updated it whenever a post is created or deleted. Otherwise, you'll slow down your DB when it grows bigger.

Answer 2

Figured it out. Smacks self in head

SELECT users.*, count( posts.user_id ) 
FROM posts LEFT JOIN users ON users.id=posts.user_id 
GROUP BY posts.user_id