Questions per tag per month

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with t as (
select count(l.PostId) as Posts_num, l.TagId as TagId, 
YEAR(r.CreationDate) as CreationYear, MONTH(r.CreationDate) as CreationMonth
from PostTags as l join PostHistory as r on l.PostId = r.PostId
Group by TagId, CreationDate
),
tt as (
select sum(Posts_num) as PostsCount, TagId, CreationYear, CreationMonth from t
group by CreationYear, CreationMonth, TagId
)
select TagId, max(CreationYear) as CreationYear, max(CreationMonth) as CreationMonth, max(PostsCount) as MaxPostsCount from tt
group by TagId order by TagId

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