SQLite3 Simulate RIGHT OUTER JOIN with LEFT JOINs and UNION

Question

I have the following select statement where I need to sum each task from table tbTasks and group them by projectId from table tbProjects in order to get a record like this:

Answer 1

Even though SQLite hasn't implemented RIGHT OUTER or FULL OUTER, it does have LEFT OUTER JOIN, which should do what you'd like. Just have tbProjects be on the left.

SELECT tbProjects.projectId, 
       COALESCE(SUM(tbTasks.taskTime), 0) AS totalTime, 
       tbProjects.projectName 
FROM tbProjects
    LEFT OUTER JOIN tbTasks ON tbProjects.projectId = tbTasks.projectId
GROUP BY tbProjects.projectId 
ORDER BY tbProjects.created DESC

You get NULLS in totalTime for projects that don't have any tasks, and the call to COALESCE() replaces the null with a 0.