joining the same table twice on different columns

Question

I\'ve got a user table and a complaint table.

The complaint table has the following structure:

[opened_by]   [         


        

Answer 1

SELECT 
     complaint.complaint_text, 
     A.username, 
     B.username
FROM 
     complaint 
     LEFT JOIN user A ON A.user_id=complaint.opened_by 
     LEFT JOIN user B ON B.user_id=complaint.closed_by