Question

This can’t be too hard, but I don’t know what the term is I’m looking for. I’m sure you guys can help me out. 🙂

I have a table tasks with rows that have a column project_id. Each project_id refers to (the id of) a row in the projects table. Each project belongs to a certain user which is why it has a column user_id.

I now want to select all tasks from this table where the project_id equals any project of a certain user.

Or put more simply:

Each TASK belongs to a PROJECT which belongs to a USER.

I want to create a SELECT-statement to receive all TASKS that belong to a specific USER. The only link between each TASK and a USER is through the PROJECT.

How do I accomplish this?

Thank you very much for your help! 🙂

Answer 1

JOIN the tables:

SELECT
  t.*
FROM tasks t
INNER JOIN projects p ON t.project_id = p.project_id
INNER JOIN users    u ON p.user_id    = u.user_id
WHERE u.user_id = @AcertianUserId