Urgent:

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, jobTitle) Project(projectID, projectName, sponsor, startYear, endYear) WorkedOn(#employeeNo, #projectID, year, month, noHours) a) List the names of projects that have started in 2016 and finished in 2020. b) List the details of employees whose job title is programmer. c) List the names of employees who are working on the project whose id is 100.