tag rankings

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Calculates rank by tag. Make tag name empty spaces for all tags

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-- tag rankings
-- Calculates rank by tag. Make tag name empty spaces for all tags

DECLARE @tagName varchar(255) 
DECLARE @tagInput bit
SET @tagname = rtrim(##TagName:string##)

IF RTRIM(@tagname) = ''

   SET @tagInput = 0 
ELSE
   SET @tagInput = 1
 

 
;WITH UserTagScores
as 
(SELECT  
   a.OwnerUserId,
   t.TagName,
   SUM(CASE v.VoteTypeID
           WHEN 2 THEN 1
           WHEN 3 THEN  -1
   END) as  score

FROM 
   votes v
   INNER JOIN Posts a
   ON v.PostID = a.ID
   INNER JOIN Posts q
   ON a.parentId = q.id
   INNER JOIN PostTags pt
   ON q.id = pt.PostId
   INNER JOIN Tags T
   ON pt.TagId = t.id
WHERE
   v.voteTypeId in (2,3)  -- Up and down votes
   and
   a.PostTypeID = 2  -- Answers only
   AND
   (a.CommunityOwnedDate is null or 
    a.CommunityOwnedDate > v.CreationDate)
   AND 
   (@tagInput = 0
    or t.TagName = @TagName)
    AND a.OwnerUserId is not null
GROUP BY
   a.OwnerUserId,
   t.TagName)
, userTagRank as (
 SELECT
    TagName,
   OwnerUserId,
    rank() over (partition by TagName order by score desc) rank
  FROM
    UserTagScores)
SELECT 
    TagName,
    Rank
FROM
    userTagRank 
WHERE 
    OwnerUserId = ##UserId##
ORDER BY
    TagName
  

  
   

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