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select PostId, SUM(CASE WHEN a.VoteTypeId = 2 THEN 1 ELSE 0 END) AS UpVotes,
  SUM(CASE WHEN a.VoteTypeId = 3 THEN 1 ELSE 0 END) AS DownVotes
FROM votes a
  INNER JOIN posts b
    ON 
      a.PostId = b.Id
      AND b.PostTypeId IN (1,2) 
WHERE 
 VoteTypeId IN (2,3) 
group by PostId

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created feb 21 13 anonymous