Question

I have two tables, “users” & “projects”

users table:

id username

---

1 sam

2 peter

3 andy

projects table:

id title uid

---

1 pr1 0

2 pr2 1

3 pr3 2

4 pr4 1

projects.uid represents the user id who will do the job and 0 means this project is not assigned to any user yet.

I want a query to count and group projects based on users & return something like this:

uid project_count

---

0 1

1 2

2 1

3 0

Answer 1

Thanks so much for your answers but none of them seems to return right rows,

here is my newly found answer:

SELECT users.id,(SELECT COUNT(1) FROM projects WHERE projects.user_id = users.id) as 'count' FROM users ORDER BY id

I’m not pretty sure about it’s performance but currently it works…