select usertag.userid as userid, max(sumtag.tagbreadth) a...

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select usertag.userid as userid, max(sumtag.tagbreadth) as tagbreadth, max(sumtag.avgtagcount) as avgtagcount, sum(square(cast(usertag.tag_count as numeric)/ cast(sumtag.tag_total as numeric))) as tagdepth, sumtag.month as month
from
(select UserList.uid as userid,  count(pt.TagId) as tag_count, pt.TagId as tagid, datediff(month,cast('2015-03-01' as datetime), p.CreationDate) as month

from Tags t, Posts p,  PostTags pt,

(select p.OwnerUserId as uid 
from Posts p,  PostTags pt, Users u
where p.OwnerUserId=u.Id and p.Id=pt.PostId
and (pt.TagId=77858) 
and p.PostTypeid=1
and p.CreationDate>=cast('2012-07-01' as datetime) 
and p.CreationDate<=cast('2015-03-01' as datetime) 
group by p.OwnerUserId
) UserList

where UserList.uid=p.OwnerUserId and p.PostTypeid=1 and pt.PostId = p.Id and pt.TagId = t.Id /*pt.*/
      and p.CreationDate>=cast('2015-03-01' as datetime) and p.CreationDate<=cast('2017-03-31' as datetime)
group by UserList.uid, pt.TagId, datediff(month,cast('2015-03-01' as datetime), p.CreationDate)
) usertag,

(select UserList.uid as userid, count(distinct(pt.TagId)) as tagbreadth, cast(count(pt.TagId)as numeric)/count(distinct(p.Id)) as avgtagcount,
 count(pt.TagId) as tag_total, datediff(month,cast('2015-03-01' as datetime), p.CreationDate) as month

from Tags t, Posts p,  PostTags pt,

(select p.OwnerUserId as uid 
from Posts p,  PostTags pt, Users u
where p.OwnerUserId=u.Id and p.Id=pt.PostId
and (pt.TagId=77858) 
and p.PostTypeid=1
and p.CreationDate>=cast('2012-07-01' as datetime) 
and p.CreationDate<=cast('2015-03-01' as datetime) 
group by p.OwnerUserId
) UserList

where UserList.uid=p.OwnerUserId and p.PostTypeid=1 and pt.PostId = p.Id and pt.TagId = t.Id
      and p.CreationDate>=cast('2015-03-01' as datetime) and p.CreationDate<=cast('2017-03-31' as datetime)
group by UserList.uid, datediff(month,cast('2015-03-01' as datetime), p.CreationDate)
) sumtag

where sumtag.userid = usertag.userid and usertag.tag_count > 0 and sumtag.tag_total > 0 and usertag.month = sumtag.month
group by usertag.userid , sumtag.month

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