create table Person(name VARCHAR(30), age int, gender VARCHAR(10)); create table Frequents(name VARCHAR(30), pizzeria VARCHAR(30)); create table Eats(name VARCHAR(30), pizza VARCHAR(30)); create table Serves(pizzeria VARCHAR(30), pizza VARCHAR(30), price float);

Using SQL

Find all pizzerias frequented by at least one person under the age of 18 and at least one person over the age of 30. Print out all the quintuples (pizzeria, person1, age1, person2, age2), where person1 and person2 are persons who frequent the pizzeria, and person1 is under the age of 18 and person2 is over the age of 30.