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 System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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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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