Question: We have the following partial database schema for an online bookstore. Book ( ISBN , title, category ) Customer ( CID , cname, gender, age

We have the following partial database schema for an online bookstore.
Book(ISBN, title, category)
Customer(CID, cname, gender, age)
Purchase(Date, CID, ISBN, seller, price)
The book categories include fiction,textbook, and sci-fi. The book price can fluctuate, i.e., the same book may have different purchase prices.
Answer the following queries with Relational Algebra and SQL.
(1) How much did the customer "Ellen" spend buying "fictions"?

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