QUESTION 12 1. Given the following schema where primary keys are underlined and foreign keys are marked with #, express in Relational Algebra the queries below: Employee (employeeNo, empName, job Title) Project (projectID, projectName, sponsor, start Year, endYear) WorkedOn (#employeeNo, #projectID, year, month, noHours) a) List the names of employees whose job Title is "database designer". [1 mark] b) List the details of the projects, which are sponsored by "Petrofac". [1 mark] c) List the names of the projects on which the employee number 100 is working. [1 mark]