Quality of content: Average amount of upvotes

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SELECT Month = DATEADD(MONTH, DATEDIFF(MONTH, 0, CreationDate), 0), 
       'Quality of content' = SUM(CASE WHEN VoteTypeId = 2 THEN 1 ELSE 0 END) / CAST(COUNT(*) AS FLOAT)
FROM PostFeedback
GROUP BY DATEADD(MONTH, DATEDIFF(MONTH, 0, CreationDate), 0)
ORDER BY Month

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