Database Tables - Person(PName, Street, City, CName, Salary) - Company(CName, City, Sales) - Branch(CName, City) Write Relational Algebra expressions to receive the result for the following queries and Tuple Relational Calculus queries for the below to retrieve the result to first three queries. Retrieve pairs of company names (i.e. (C1,C2)) in which both companies are headquartered in Redmond and the sales of the first company (i.e. C1) is higher than the sales of the second company (i.e. C2)