Please I need your help in relational algebra and SQL. Thank you

Write the following queries in relational algebra and SQL using the COMPANY database schema. EMPLOYEE n AME IMPIT | AME 1.sept t DATE | ress I six SALA" s rres.IDO DEPT LOCATIONS DLOCATION PROJECT WORKS ON DEPENDENT (a) For each project on which more than two employees work, retrieve the project number, the project name, and the number of employees who work on that project. RA SQL: (b) Retrieve the names of all employees who do not have supervisors RA SQL