get average of query result

Ive got query like this:

select distinct UserID, Count(UserId) as MyNumber from  dbo.User2User gro开发者_如何学Cup by UserId

now I would like extend this query to get MIN, MAX and AVG of MyNumber

no idea how to get to this value from another select or sth ...

thanks for help

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You can use your own query as a subquery :

SELECT MIN(MyNumber) AS minNumber, MAX(MyNumber) AS maxNumber, AVG(myNumber) AS avgNumber
FROM (SELECT UserID, COUNT(UserID) AS MyNumber
      FROM dbo.User2User
      GROUP BY UserID) TMP;

Note that the DISTINCT keyword isn't necessary : GROUP BY already selects distinct UserID.