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Finally…
•I still have only the result of:
•         SELECT  seller, buyer, Count(*)
•         FROM     Purchase
•         WHERE   Purchase.store = ‘The Bon’
•         Group By seller, buyer
•but I want to answer the query
•         SELECT  seller, Count(*)
•         FROM     Purchase
•         WHERE   Person.store = ‘The Bon’   
•         Group By seller
•