employee (person_name, street, city ) works (person_name, company_name, salary) company (company_name, city) manages (person_name, manager_name) Figure 6.22 Relational database for Exercises 6.2, 6.8, 6.11, 6.13, and 6.15 6.11 Consider the relational database of Figure 6.22, where the primary keys are underlined. Give an expression in the relational algebra to express each of the following queries: d. Find the names of all employees in this database who live in the same city as the company for which they work