Alternate Plans
Find names of people who bought telephony products
Purchase
Person
Buyer=name
Category=“telephony”
buyer
(hash join)
Product
prod=pname
(hash join)
Purchase
Product
Buyer=name
Category=“telephony”
buyer
(hash join)
Person
prod=pname
(hash join)
?
?
But what if we’re only looking for Bob’s purchases?
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