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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 @5MonthsAgo datetime = DATEADD(month, -5, GETDATE())
DECLARE @6MonthsAgo datetime = DATEADD(month, -6, 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), @t1g4 decimal (12,6), @t1g4Text nvarchar(max)
DECLARE @Tag1Count5Months decimal (12,6), @Tag1Count5MonthsText nvarchar(max), @t1g5 decimal (12,6), @t1g5Text nvarchar(max)
DECLARE @Tag1Count6Months decimal (12,6), @Tag1Count6MonthsText 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), @t2g4 decimal (12,6), @t2g4Text nvarchar(max)
DECLARE @Tag2Count5Months decimal (12,6), @Tag2Count5MonthsText nvarchar(max), @t2g5 decimal (12,6), @t2g5Text nvarchar(max)
DECLARE @Tag2Count6Months decimal (12,6), @Tag2Count6MonthsText nvarchar(max)


-- Tag 1 Activity 
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 > @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 > @2MonthsAgo 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 > @3MonthsAgo and posts.creationdate < @2MonthsAgo
group by tagname);

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 > @4MonthsAgo and posts.creationdate < @5MonthsAgo
group by tagname);

SET @Tag1Count5Months = (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 > @5MonthsAgo and posts.creationdate < @4MonthsAgo
group by tagname);

SET @Tag1Count6Months = (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 > @6MonthsAgo and posts.creationdate < @5MonthsAgo
group by tagname);

SET @Tag1Count6MonthsText = convert(varchar,convert(int,@Tag1Count6Months))

SET @t1g1 = (@Tag1Count5Months-@Tag1Count6Months) / @Tag1Count6Months * 100.0;
SET @t1g1Text = convert(varchar,convert(decimal(5,2),@t1g1)) + '%'
SET @Tag1Count5MonthsText = convert(varchar,convert(int,@Tag1Count5Months))

SET @t1g2 = (@Tag1Count4Months-@Tag1Count5Months) / @Tag1Count5Months * 100.0;
SET @t1g2Text = convert(varchar,convert(decimal(5,2),@t1g2)) + '%'
SET @Tag1Count4MonthsText = convert(varchar,convert(int,@Tag1Count4Months))

SET @t1g3 = (@Tag1Count4Months-@Tag1Count3Months) / @Tag1Count4Months * 100.0;
SET @t1g3Text = convert(varchar,convert(decimal(5,2),@t1g3)) + '%'
SET @Tag1Count3MonthsText = convert(varchar,convert(int,@Tag1Count3Months))

SET @t1g4 = (@Tag1Count3Months-@Tag1Count2Months) / @Tag1Count2Months * 100.0;
SET @t1g4Text = convert(varchar,convert(decimal(5,2),@t1g4)) + '%'
SET @Tag1Count2MonthsText = convert(varchar,convert(int,@Tag1Count2Months))

SET @t1g5 = (@Tag1Count2Months-@Tag1Count1Months) / @Tag1Count2Months * 100.0;
SET @t1g2Text = convert(varchar,convert(decimal(5,2),@t1g5)) + '%'
SET @Tag1Count1MonthsText = convert(varchar,convert(int,@Tag1Count1Months))


SELECT 'Tag', 'Posts', 'Change', 'Date'
UNION ALL
SELECT @Tag1, @Tag1Count6MonthsText, '', '6 months ago'
UNION ALL
SELECT @Tag1, @Tag1Count5MonthsText, @t1g1Text, '5 months ago'
UNION ALL
SELECT @Tag1, @Tag1Count4MonthsText, @t1g2Text, '4 months ago'
UNION ALL
SELECT @Tag1, @Tag1Count3MonthsText, @t1g3Text, '3 months ago'
UNION ALL
SELECT @Tag1, @Tag1Count2MonthsText, @t1g4Text, '2 months ago'
UNION ALL
SELECT @Tag1, @Tag1Count1MonthsText, @t1g5Text, '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