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select
rate4.TagName as Tag,
row_number() over (order by rate4.Rate desc) as Q1Rank,
row_number() over (order by rate5.Rate desc) as Q2Rank,
rate4.Rate as Q1,
rate5.Rate as Q2

from

(select count(PostId) as Rate, TagName
from
Tags, PostTags, Posts
where Tags.Id = PostTags.TagId and Posts.Id = PostId
and Posts.CreationDate > DATEADD(month, -3, GETDATE())
and Posts.CreationDate <= GETDATE()
group by TagName) as rate4

LEFT JOIN

(select count(PostId) as Rate, TagName
from
Tags, PostTags, Posts
where Tags.Id = PostTags.TagId and Posts.Id = PostId
and Posts.CreationDate > DATEADD(month, -6, GETDATE())
and Posts.CreationDate <= DATEADD(month, -3, GETDATE())
group by TagName) as rate5
ON rate5.TagName = rate4.TagName

order by Q1Rank
;

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edited nov 29

created may 18 Orkhan.Jafarov