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DECLARE @Tag1 nvarchar(max) = 'angularjs'

DECLARE @1MonthsAgo datetime = DATEADD(month, -1, GETDATE())
DECLARE @2MonthsAgo datetime = DATEADD(month, -2, GETDATE())
DECLARE @3MonthsAgo datetime = DATEADD(month, -3, GETDATE())

SELECT TagName, COUNT(*) AS Posts FROM Tags
    INNER JOIN PostTags ON PostTags.TagId = Tags.id
    INNER JOIN Posts ON Posts.ParentId = PostTags.PostId
where tagname = @Tag1 AND
posts.creationdate > @1MonthsAgo
group by tagname

SELECT TagName, COUNT(*) AS Posts FROM Tags
    INNER JOIN PostTags ON PostTags.TagId = Tags.id
    INNER JOIN Posts ON Posts.ParentId = PostTags.PostId
where tagname = @Tag1 AND
posts.creationdate > @2MonthsAgo and posts.creationdate < @1MonthsAgo
group by tagname

SELECT TagName, COUNT(*) AS Posts FROM Tags
    INNER JOIN PostTags ON PostTags.TagId = Tags.id
    INNER JOIN Posts ON Posts.ParentId = PostTags.PostId
where tagname = @Tag1 AND
posts.creationdate > @3MonthsAgo and posts.creationdate < @2MonthsAgo
group by tagname

view current version

edited dec 29 12

created dec 29 12 Lee Whitney