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Q&A for professionals, academics, and students working within the systems development life cycle

SELECT Month = DATEADD(MONTH, DATEDIFF(MONTH, 0, p.CreationDate), 0),
             'Up-to-date content' = 1 - CAST(AVG(DATEDIFF(hour, p1.CreationDate, p.CreationDate)) AS FLOAT) /
             (SELECT max = MAX([Average amount of hours between question posed and answered])
              FROM (
                    SELECT Month = DATEADD(MONTH, DATEDIFF(MONTH, 0, p.CreationDate), 0),
                           'Average amount of hours between question posed and answered' = AVG(DATEDIFF(hour, p1.CreationDate, p.CreationDate))
                    FROM Posts p
                    INNER JOIN Posts p1 ON p.Id = p1.AcceptedAnswerId
                    GROUP BY DATEADD(MONTH, DATEDIFF(MONTH, 0, p.CreationDate), 0)
                   ) AS calculate_max)
FROM Posts p
INNER JOIN Posts p1 ON p.Id = p1.AcceptedAnswerId
GROUP BY DATEADD(MONTH, DATEDIFF(MONTH, 0, p.CreationDate), 0)
ORDER BY Month

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edited jun 11 19

created mar 25 19 Iulia.Ionescu