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SELECT 
  DATEADD(##AI##, DATEDIFF(##AI##, 0, CreationDate), 0) AS [##AI##]
  , COUNT(DISTINCT Posts.Id) AS Count
FROM Posts
INNER JOIN PostTags ON PostTags.PostId = Posts.Id
INNER JOIN Tags ON PostTags.TagId = Tags.Id
WHERE Tags.TagName like 'firebase%' AND PostTypeId = 1 AND CreationDate > '2012-01-01'
GROUP BY DATEADD(##AI##, DATEDIFF(##AI##, 0, CreationDate), 0)
ORDER BY [##AI##] DESC

-- AI: Aggregation Interval (MONTH, YEAR, WEEK)

view current version

edited dec 1 20

created feb 8 16 Frank van Puffelen