Q&A for teachers and students of the Esperanto language
SELECT tgs.TagName as Tag ,CONCAT(YEAR(pst.CreationDate),FORMAT(Month(pst.CreationDate),'00')) as YearMonth ,usr.DisplayName as "User" ,COUNT(DISTINCT usr.Id) as NoOfUsers ,COUNT(DISTINCT pst.Id) as NoOfPosts FROM Users usr Inner Join Posts pst ON pst.OwnerUserID = usr.Id Inner Join PostTags psttg ON psttg.PostId = pst.Id Inner Join Tags tgs ON tgs.Id = psttg.TagId WHERE 1=1 and UPPER(usr.DisplayName) like 'ANDR%' and UPPER(tgs.TagName) = 'CSS' and pst.CreationDate >= CAST('2019-01-01' AS DATE) and pst.CreationDate < CAST('2020-01-01' AS DATE) GROUP BY tgs.TagName, CONCAT(YEAR(pst.CreationDate),FORMAT(Month(pst.CreationDate),'00')),usr.DisplayName ORDER BY YearMonth ;