Consider a database with the following schema: Person ( name, age, gender ) name is a key Frequents ( name, pizzeria ) (name, pizzeria) is a key Eats ( name, pizza ) (name, pizza) is a key Serves ( pizzeria, pizza, price ) (pizzeria, pizza) is a key Write relational algebra/SQL expressions for the following: a. Find the names of all females who eat both mushroom and pepperoni pizza. b. For each person, find all pizzas the person eats that are not served by any pizzeria the person frequents. Return all such person (name) / pizza pairs. c. Find all pizzerias that are frequented by only females or only male
Consider a database with the following schema: Person ( name, age, gender ) name is a key Frequents ( name, pizzeria ) (name, pizzeria) is a key Eats ( name, pizza ) (name, pizza) is a key Serves ( pizzeria, pizza, price ) (pizzeria, pizza) is a key Write relational algebra/SQL expressions for the following: a. Find the names of all females who eat both mushroom and pepperoni pizza. b. For each person, find all pizzas the person eats that are not served by any pizzeria the person frequents. Return all such person (name) / pizza pairs. c. Find all pizzerias that are frequented by only females or only male
Database Systems: Design, Implementation, & Management
11th Edition
ISBN:9781285196145
Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Chapter10: Transaction Management And Concurrency Control
Section: Chapter Questions
Problem 1P
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Question
Consider a
Person ( name, age, gender ) name is a key
Frequents ( name, pizzeria ) (name, pizzeria) is a key
Eats ( name, pizza ) (name, pizza) is a key
Serves ( pizzeria, pizza, price ) (pizzeria, pizza) is a key
Write relational algebra/SQL expressions for the following:
a. Find the names of all females who eat both mushroom and pepperoni pizza.
b. For each person, find all pizzas the person eats that are not served by any pizzeria the person
frequents. Return all such person (name) / pizza pairs.
c. Find all pizzerias that are frequented by only females or only males.
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