How many questions per month does each tag in the top 10 tags get
プログラマーとプログラミングに熱心な人々のための質問と回答
select *, count(*) from ( select CAST( cast(DATEPART(YYYY, CreationDate) as varchar) + '-' + cast(DATEPART(MM, CreationDate) as varchar) + '-01' as datetime) Month, t.TagName from Posts p join PostTags pt on pt.PostId = p.Id join Tags t on t.Id = pt.TagId where t.TagName in ('haskell', 'clojure', 'scala', 'smalltalk', 'lisp', 'scheme', 'erlang', 'ocaml', 'caml', 'f#') ) as X group by TagName, Month order by Month asc, count(*) desc