Write queries for 1, 2 and 3 in Relational Algebra, and write queries for 1 and 2 in Tuple Relational Calculus.

PERSON PNAME, STREET, CITY) WORKS(PNAME, CNAME, SALARY) COMPANY(CNAME, CITY) PERSON gives the names and addresses of persons. WORKS gives the names of companies for which a person works together with his/her salary. COMPANY gives the cities in which each company has a branch. 1) Find the names and addresses (i.e., STREET, CITY) of all employees who work for "Facebook' 2) Find the names of all employees that work for the companies which only have branch es in Chicago 3) Find the names of all companies that have a branch in every city where "Facebook" also h as a branch