instruction: JavaScript MVC Framework Trends (from TodoMVC) (# of Questions per Month).
response: SELECT DATEADD(mm, (YEAR(2017) - 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 ('backbone.js', 'ember.js', 'knockout.js', 'dojo', 'polymer', 'reactjs', 'kendo-ui', 'extjs', 'angularjs') AND PostTypes.Name = 'Question' GROUP BY YEAR(Posts.CreationDate), MONTH(Posts.CreationDate), Tags.TagName ORDER BY YEAR(Posts.CreationDate), MONTH(Posts.CreationDate), Tags.TagName