Relational Algebra - Need Help Urgent Please

[COLOR=“blue”]Hello everyone,

I am working on a relational algebra questions, and got stock on this one :frowning: . I How to write a relational algebra that can retrieve the ids of the most expensive shoes from these tables?

Shoes(id, name, size)
Store(name,location, phoneNumber)
Sells(storename, id, price)

I would be very thankful, if you could provide me with your assistance.


SELECT id FROM sells WHERE price = ( something else goes here )

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