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SELECT
    DATEADD(MONTH, DATEDIFF(MONTH, 0, CreationDate), 0) AS Month,
    SUM(CASE WHEN PostTypeId = 1 THEN 1 ELSE 0 END) AS QuestionCount,
    SUM(CASE WHEN PostTypeId = 2 THEN 1 ELSE 0 END) AS AnswerCount
FROM
    Posts
WHERE 
    CreationDate > '2009-01-01'
GROUP BY
    DATEADD(MONTH, DATEDIFF(MONTH, 0, CreationDate), 0)
ORDER BY
    Month;

fork query

edited nov 15

created nov 15 anonymous