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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 decimal (12,6), @Tag1Count1MonthsText nvarchar(max), @t1g1 decimal (12,6), @t1g1Text nvarchar(max)
DECLARE @Tag1Count2Months decimal (12,6), @Tag1Count2MonthsText nvarchar(max), @t1g2 decimal (12,6), @t1g2Text nvarchar(max)
DECLARE @Tag1Count3Months decimal (12,6), @Tag1Count3MonthsText nvarchar(max), @t1g3 decimal (12,6), @t1g3Text nvarchar(max)
DECLARE @Tag1Count4Months decimal (12,6), @Tag1Count4MonthsText nvarchar(max)

DECLARE @Tag2Count1Months decimal (12,6), @Tag2Count1MonthsText nvarchar(max), @t2g1 decimal (12,6), @t2g1Text nvarchar(max)
DECLARE @Tag2Count2Months decimal (12,6), @Tag2Count2MonthsText nvarchar(max), @t2g2 decimal (12,6), @t2g2Text nvarchar(max)
DECLARE @Tag2Count3Months decimal (12,6), @Tag2Count3MonthsText nvarchar(max), @t2g3 decimal (12,6), @t2g3Text nvarchar(max)
DECLARE @Tag2Count4Months decimal (12,6), @Tag2Count4MonthsText nvarchar(max)

-- Tag 1 Activity 
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);

SET @Tag1Count4MonthsText = convert(varchar,convert(int,@Tag1Count4Months))

SET @t1g1 = (@Tag1Count3Months-@Tag1Count4Months) / @Tag1Count3Months * 100.0;
SET @t1g1Text = convert(varchar,convert(decimal(5,2),@t1g1)) + '%'
SET @Tag1Count3MonthsText = convert(varchar,convert(int,@Tag1Count3Months))

SET @t1g2 = (@Tag1Count2Months-@Tag1Count3Months) / @Tag1Count2Months * 100.0;
SET @t1g2Text = convert(varchar,convert(decimal(5,2),@t1g2)) + '%'
SET @Tag1Count2MonthsText = convert(varchar,convert(int,@Tag1Count2Months))

SET @t1g3 = (@Tag1Count1Months-@Tag1Count2Months) / @Tag1Count1Months * 100.0;
SET @t1g3Text = convert(varchar,convert(decimal(5,2),@t1g3)) + '%'
SET @Tag1Count1MonthsText = convert(varchar,convert(int,@Tag1Count1Months))

-- Tag 2 Activity
-- Tag 1 Activity 
SET @Tag2Count4Months = (SELECT 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);

SET @Tag2Count3Months = (SELECT 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);

SET @Tag2Count2Months = (SELECT 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);

SET @Tag2Count1Months = (SELECT 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);

SET @Tag2Count4MonthsText = convert(varchar,convert(int,@Tag2Count4Months))

SET @t2g1 = (@Tag2Count3Months-@Tag2Count4Months) / @Tag2Count3Months * 100.0;
SET @t2g1Text = convert(varchar,convert(decimal(5,2),@t2g1)) + '%'
SET @Tag2Count3MonthsText = convert(varchar,convert(int,@Tag2Count3Months))

SET @t2g2 = (@Tag2Count2Months-@Tag2Count3Months) / @Tag2Count2Months * 100.0;
SET @t2g2Text = convert(varchar,convert(decimal(5,2),@t2g2)) + '%'
SET @Tag2Count2MonthsText = convert(varchar,convert(int,@Tag2Count2Months))

SET @t2g3 = (@Tag2Count1Months-@Tag2Count2Months) / @Tag2Count1Months * 100.0;
SET @t2g3Text = convert(varchar,convert(decimal(5,2),@t2g3)) + '%'
SET @Tag2Count1MonthsText = convert(varchar,convert(int,@Tag2Count1Months))


SELECT 'Tag', 'Posts', 'Change', 'Date'
UNION ALL
SELECT @Tag1, @Tag1Count4MonthsText, '', '4 months ago'
UNION ALL
SELECT @Tag1, @Tag1Count3MonthsText, @t1g1Text, '3 months ago'
UNION ALL
SELECT @Tag1, @Tag1Count2MonthsText, @t1g2Text, '2 months ago'
UNION ALL
SELECT @Tag1, @Tag1Count1MonthsText, @t1g3Text, 'last month'
UNION ALL
SELECT '', '', '', ''
UNION ALL
SELECT @Tag2, @Tag2Count4MonthsText, '', '4 months ago'
UNION ALL
SELECT @Tag2, @Tag2Count3MonthsText, @t2g1Text, '3 months ago'
UNION ALL
SELECT @Tag2, @Tag2Count2MonthsText, @t2g2Text, '2 months ago'
UNION ALL
SELECT @Tag2, @Tag2Count1MonthsText, @t2g3Text, 'last month'

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edited dec 30 12

created dec 29 12 Lee Whitney