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Q&A about the site for students, teachers, and linguists wanting to discuss the finer points of the Italian language

-- For a particular tag, average Upvotes per Answer per user

SELECT
   Users.Id,
   Users.DisplayName,
   COUNT(Posts.Id) As NumPosts,
   SUM(Posts.Score) As SumScore,
   AVG(Posts.Score) As AvgScore,
   STDEV(Posts.Score) As StdDevScore
FROM Posts
INNER JOIN Users ON Posts.OwnerUserID = Users.Id
WHERE Posts.PostTypeID = 2
AND Posts.ParentId IN (
-- Posts with a particular tag
SELECT
Posts.Id
FROM Posts
INNER JOIN PostTags ON Posts.Id = PostTags.PostId
INNER JOIN Tags ON PostTags.TagId = Tags.Id
WHERE Posts.PostTypeID = 1
AND Tags.TagName = '##tagname##'
)

GROUP BY Users.Id, Users.DisplayName
HAVING    COUNT(Posts.Id) >= 10

fork query

created dec 15 10 Ryan