Q&A about the site for expert genealogists and people interested in genealogy or family history
SELECT COUNT(*) AS 'Users with no questions in 2015' FROM Users As u WHERE NOT EXISTS ( SELECT 1 FROM Posts AS p WHERE p.OwnerUserId = u.Id AND p.PostTypeId = (SELECT Id FROM PostTypes WHERE Name = 'Question') AND YEAR(p.CreationDate) = 2015);