gams-math Trends (# คำถามต่อแท็กต่อเดือน ไม่จำเป็นต้องใช้ทุกตาราง)
gams-math Trends (# Questions per Tag per Month.It is not neccessary to use all the tables.
 PostHistoryTypes:  Id [ number]  Name [ text] 
SELECT DATEADD(mm, (YEAR(Posts.CreationDate) - 1900) * 12 + MONTH(Posts.CreationDate) - 1, 0) AS Month, Tags.TagName, COUNT(*) AS Questions FROM Tags LEFT JOIN PostTags ON PostTags.TagId = Tags.Id LEFT JOIN Posts ON Posts.Id = PostTags.PostId LEFT JOIN PostTypes ON PostTypes.Id = Posts.PostTypeId WHERE Tags.TagName IN ('c#', 'java', 'c++', 'collision-detection', 'camera', 'performance', 'textures', 'client-server', 'physics', 'geometry', 'mathematics', 'animation', 'networking') AND PostTypes.Name = 'Question' AND Posts.CreationDate < DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0) GROUP BY YEAR(Posts.CreationDate), MONTH(Posts.CreationDate), Tags.TagName ORDER BY YEAR(Posts.CreationDate), MONTH(Posts.CreationDate), Tags.TagName