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out of my mind, not tested as I have no such files at hand

select <CustomerNumber>, avg(count(*)) from <transactionFile>
   group by <CustomerNumber>
   order by <CustomerNumber>

replace names within <> with the correct ones

hth Rolf

~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dipl.Inf.(FH) Rolf P Mittag
IBM Partner in Development
Leipziger Str. 50
D-69214 Eppelheim
Fon: +49 (6221) 76 78 60
Fax: +49 (6221) 76 80 26
eMl: rm@r-m-e-d-v.de
~~~~~~~~~~~~~~~~~~~~~~~~~~~


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