Number of active users in a set of tags month wise


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A user is considered "active" if they have > "threshhold" posts in the given set of tags, where "threshhold" is a parameter that can be set by modifying the textbox below.

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select [Month], 
       sum(1) ActiveUsers

select Z.[Month], count(Z.ouid) cnt, Z.ouid as [User Link] 
select CAST(
      cast(DATEPART(YYYY, Y.CreationDate) as varchar) + '-' + cast(DATEPART(MM, Y.CreationDate) as varchar) + '-01'
      as datetime) [Month], ouid
  from (
   select p1.creationdate  CreationDate ,p1.owneruserid  ouid from posts p1
      inner join posts p2  on 
      where p1.posttypeid=2 and 
      (p2.tags LIKE '%quantum-field-theory%'
OR p2.tags LIKE '%general-relativity%'
OR p2.tags LIKE '%string-theory%'
OR p2.tags LIKE '%quantum-gravity%'
OR p2.tags LIKE '%statistical-mechanics%'
OR p2.tags LIKE '%condensed-matter%'
OR p2.tags LIKE '%renormalization%')  
group by p1.owneruserid, p1.creationdate
  ) Y group by ouid, CreationDate
) Z group by Z.ouid,Z.[Month]

) as X where X.cnt>##Threshhold?2##
group by [Month]
order by [Month] asc

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