How to make staff sales report and stock report

Dear All

First table with names. second table with store items.

I read the northwind for preparing invoices which does not fit my requirement.

Pls give me links for me to read up on how to prepare report on persons who
have made purchases by linking these two tables.

Pls give any links where I can read on how to go about to prepare a report
on persons who made purchases; report of stores opening stock, quantity sold
and stock balance etc.
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