WITH TopTags AS ( SELECT TagName, OwnerUserId, COUNT(Vote...

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WITH TopTags AS (
  SELECT TagName, OwnerUserId, COUNT(Votes.Id) AS UpVotes FROM Tags
    INNER JOIN PostTags ON PostTags.TagId = Tags.id
    INNER JOIN Posts ON Posts.ParentId = PostTags.PostId
    INNER JOIN Votes ON Votes.PostId = Posts.Id and VoteTypeId = 2
  WHERE OwnerUserId = 340760
  GROUP BY TagName, OwnerUserId
)
SELECT
  STRING_AGG(case when seqnum <= 5 then TagName end, ', ')
FROM (
  SELECT TagName, OwnerUserId, UpVotes, dense_rank() over (partition by OwnerUserId order by UpVotes DESC) as seqnum
  FROM TopTags
) x

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