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DECLARE @Tag1 nvarchar(max) = 'angularjs'
DECLARE @Tag2 nvarchar(max) = 'knockout.js'

DECLARE @1MonthsAgo datetime = DATEADD(month, -1, GETDATE())
DECLARE @2MonthsAgo datetime = DATEADD(month, -2, GETDATE())
DECLARE @3MonthsAgo datetime = DATEADD(month, -3, GETDATE())
DECLARE @4MonthsAgo datetime = DATEADD(month, -4, GETDATE())

DECLARE @Tag1Count1Months int
DECLARE @Tag1Count2Months int
DECLARE @Tag1Count3Months int
DECLARE @Tag1Count4Months int

DECLARE @Tag2Count1Months int
DECLARE @Tag2Count2Months int
DECLARE @Tag2Count3Months int
DECLARE @Tag2Count4Months int

-- Tag 1 Activity Last 3 months
SET @Tag1Count4Months = (SELECT 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);

SET @Tag1Count3Months = (SELECT 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);

SET @Tag1Count2Months = (SELECT 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);

SET @Tag1Count1Months = (SELECT 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 > @4MonthsAgo and posts.creationdate < @3MonthsAgo
group by tagname);

select @Tag1Count4Months, @Tag1Count3Months

-- Tag 2 Activity Last 3 months
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 = @Tag2 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 = @Tag2 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 = @Tag2 AND
posts.creationdate > @3MonthsAgo and posts.creationdate < @2MonthsAgo
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 = @Tag2 AND
posts.creationdate > @4MonthsAgo and posts.creationdate < @3MonthsAgo
group by tagname

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edited dec 29 12

created dec 29 12 Lee Whitney