Q&A for professional and enthusiast programmers
SELECT DATEADD(mm, (Year(Votes.CreationDate) - 1900) * 12 + Month(Votes.CreationDate) - 1, 0) AS Month, Tags.TagName, cast(COUNT(*) as decimal)/20.0 AS Upvotes -- AVG(Score) AS Scores FROM Tags LEFT JOIN PostTags ON PostTags.TagId = Tags.Id --LEFT JOIN Posts ON Posts.Id = PostTags.PostId LEFT JOIN Votes ON Votes.PostId = PostTags.PostId --LEFT JOIN PostTypes ON PostTypes.Id = Posts.PostTypeId WHERE Tags.TagName IN ('c#','java') --AND --PostTypes.Name = 'Question' -- Exclude the current month --Posts.CreationDate < DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0) GROUP BY Year(Votes.CreationDate), Month(Votes.CreationDate), Tags.TagName ORDER BY Year(Votes.CreationDate), Month(Votes.CreationDate), Tags.TagName