Q&A for power users of Apple hardware and software
SELECT DATEPART(yyyy, Posts.CreationDate) AS PostYear, CAST(DATEPART(yyyy, Users.CreationDate) AS VARCHAR(MAX)) AS RegYear, COUNT(*) AS Count FROM Posts, Users WHERE Posts.OwnerUserId = Users.Id AND Posts.CreationDate > Users.CreationDate GROUP BY DATEPART(yyyy, Users.CreationDate), DATEPART(yyyy, Posts.CreationDate) ORDER BY RegYear, PostYear