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Q&A for professionals and students of engineering

SELECT  TagName AS Tags, AVG(Age * 1.0) AS [Average Answerer's Age], COUNT(*) AS [Number of Answerers]
FROM    (
        SELECT  DISTINCT pa.OwnerUserId, pt.TagId
        FROM    Users u
        JOIN    Posts pa
        ON      pa.OwnerUserId = U.Id
        JOIN    Posts pq
        ON      pq.Id = pa.ParentId
        JOIN    PostTags pt
        ON      pt.PostId = pq.Id
        ) ut
JOIN    Tags t
ON      t.Id = ut.TagId
JOIN    Users u
ON      u.Id = ut.OwnerUserId
WHERE   u.Age BETWEEN 10 AND 90
GROUP BY
        t.Id, t.TagName
HAVING  COUNT(*) > 10
ORDER BY
        2 DESC

fork query

edited may 16 12 anonymous

created may 31 10 Quassnoi