You need count(*) of the transaction file divided by count(*) of the
customer master.  I can't see any way of doing that in one statement.


> From: Matthias Oertli
> Given a customer master file (one record per customer) and a transaction
> file (one record per transaction, one customer can have many
> transactions), how would it be possible to find the average number of
> transactions per customer with one single SQL statement?

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