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SELECT
    NumClosed,
    NumQuestions,
    NumClosed * 100.0 / NumQuestions AS PercentClosed
FROM (
    SELECT
        COUNT(CASE WHEN ClosedDate IS NOT NULL THEN 1 END) AS NumClosed,
        COUNT(*) AS NumQuestions
    FROM Posts
    WHERE
        PostTypeId = 1 -- Questions
) Counts

fork query

edited oct 8 17

created oct 8 17 jpmc26