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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)


-- 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);

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))

SELECT 'Tag', 'Posts', 'Change', 'Date'
UNION ALL
SELECT @Tag1, @Tag1Count4MonthsText, '', 'month -4'
UNION ALL
SELECT @Tag1, @Tag1Count3MonthsText, @t1g1Text, 'month -3'
UNION ALL
SELECT @Tag1, @Tag1Count2MonthsText, @t1g2Text, 'month -2'
UNION ALL
SELECT @Tag1, @Tag1Count1MonthsText, @t1g3Text, 'month -1 (last 30 days)'

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