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

insert into #tags 

select 
DATEADD(WEEK, DATEDIFF(WEEK, 0, CreationDate), 0) AS [WEEK],
t.TagName,
count(*) as Count
from Posts p
join PostTags pt on pt.PostId = p.Id
join Tags t on t.Id = pt.TagId 
where 
p.CreationDate > '2019-06-01'
AND
(t.TagName like 'firebase-%' or t.TagName = 'google-cloud-functions' or t.TagName = 'google-cloud-firestore')
group by t.TagName,
         DATEADD(WEEK, DATEDIFF(WEEK, 0, CreationDate), 0)
order by [WEEK] desc;


select * from #tags 
where TagName in
(
select TOP 20 TagName from #tags where Date in (
select TOP 20 Date from #tags order by Date desc
) order by Count desc
)
order by [Date] desc;

view current version

edited apr 1 20

created may 24 18 Frank van Puffelen