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

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A:

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Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.