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-- Up vs Down votes by day of week of Question or Answer

SELECT
    CASE WHEN PostTypeId = 1 THEN 'Question' ELSE 'Answer' END As [Post Type],
    DATENAME(WEEKDAY, p.CreationDate) AS Day,
    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,
    CASE WHEN SUM(CASE WHEN VoteTypeId = 3 THEN 1 ELSE 0 END) = 0 THEN NULL
     ELSE (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))
    END AS UpVoteDownVoteRatio
FROM
    Votes v JOIN Posts p ON v.PostId=p.Id
WHERE
    PostTypeId In (1,2)
 AND
    VoteTypeId In (2,3)
GROUP BY
    PostTypeId, DATEPART(WEEKDAY, p.CreationDate), DATENAME(WEEKDAY, p.CreationDate)
ORDER BY
    PostTypeId, DATEPART(WEEKDAY, p.CreationDate)

fork query

edited may 10 12

created may 29 10 Mark Hurd