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select
  cast(cast(t.yr as varchar(4))+'-'+cast(t.mnth as varchar(2))+'-01' as date) as dt
  ,t.r_mnth_count
  ,t.py_mnth_count
from
(
  select
    month(CreationDate) as mnth
    ,year(CreationDate) as yr
    -- count <r> tags
    ,sum(case when tags like '%<r>%' then 1 else 0 end) as r_mnth_count
    -- count <python> tags
    ,sum(case when tags like '%<python>%' then 1 else 0 end) as py_mnth_count
  from
    posts
  where
    -- tags are wrapped by <>
    tags like '%<r>%'
    or tags like '%<python>%'
  group by month(CreationDate), year(CreationDate)
) as t
-- exclude last (incomplete) month
where not (t.mnth=month(GETDATE()) and t.yr=year(GETDATE()))
and yr>=2011
order by t.yr asc, t.mnth asc

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edited aug 14 15

created aug 14 15 cryo111