2. Using the following schema, write the following queries in relational algebra (20 points): Emp(eid, ename, salary) E Works(eid, did, pct_time) W Dept(did, dname, budget, manager eid) D 1. List the employee names of employees who did not work in the 'R&D' department 2. List the employee names of employee who have worked in all departments 3. List the names of managers who manage a department with a budget over $1,000,000 4. List the names of managers who managed more than one department