query normal length users day


a chairman uses cave phone churned times per day, length calls vary. i am tracking length calls table:



calls [callid, memberid, starttime, duration]


i need query relapse normal length users per day. per means, user used phone 3 times, initial 5 minutes, second 10 mins final 7 minutes, calculation is: 5 + 10 + 7 / 3 = ...



note:




  1. people don't phone everyday, have latest day's normal per chairman altogether normal duration.


  2. we don't wish count anyone twice average, wholly 1 quarrel per user calculating normal daily duration.




some clarifications...



i need altogether per average, formed per-user per-day average, controlling users latest days numbers (since wholly counting given user once query), meant controlling opposite days avg. given competence phone any same even.



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