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create table #tags (Date date, TagName nvarchar (35), Count int, 
TotalCount int);

insert into #tags 

select 
DATEADD(MONTH, DATEDIFF(MONTH, 0, CreationDate), 0) AS [MONTH],
t.TagName,
count(*) as Count,
(select count(*) from Posts) as TotalCount
from Posts p
join PostTags pt on pt.PostId = p.Id
join Tags t on t.Id = pt.TagId 
where 
p.CreationDate > '2016-01-01'
AND
(t.TagName = 'google-cloud-firestore'
or t.TagName = 'mongodb'
or t.TagName = 'pandas' or t.TagName = 'postgresql')

group by t.TagName,
         DATEADD(MONTH, DATEDIFF(MONTH, 0, CreationDate), 0)
order by [MONTH] desc;


select * from #tags 
where TagName in
(
select TOP 30 TagName from #tags where Date in (
select TOP 30 Date from #tags order by Date desc
) order by Count desc
)
order by [Date] desc;

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edited jun 5 anonymous

created mar 16 16 user2314737