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-- Up vs Down votes by hour of day of Accepted Answer

SELECT
    DATEPART(HOUR, p.CreationDate) AS Hour,
    Count(*) AS Amount,
    SUM(CASE WHEN VoteTypeId = 2 THEN 1 ELSE 0 END) AS UpVotes,
    SUM(CASE WHEN VoteTypeId = 3 THEN 1 ELSE 0 END) AS DownVotes,
    (CAST(SUM(CASE WHEN VoteTypeId = 2 THEN 1 ELSE 0 END) AS float) / CAST(SUM(CASE WHEN VoteTypeId = 3 THEN 1 ELSE 0 END) AS float)) AS UpVoteDownVoteRatio
FROM
    Votes v JOIN Posts p ON v.PostId=p.AcceptedAnswerId
WHERE
    PostTypeId = 1 AND AcceptedAnswerId IS NOT NULL
GROUP BY
    DATEPART(HOUR, p.CreationDate)
ORDER BY
    DATEPART(HOUR, p.CreationDate)

fork query

created aug 4 10 Mark Hurd