SQL Query

Find the names of those who worked on exactly two projects.

E- Employee (Ename, SSN, Age, salary, Supervisor_SSN, Dno) D - Department (Dname, Dnumber, Dlocation, Manager_SSN, Mgr_StartingDate) P - Project (Pname, Pnumber, Plocation) W- Works_On (ESSN, Pno, Hours) De - Dependent (ESSN, D_name, DoB, Relationship) and the following set of foreign keys: Employee.Supervisor_SSN >Employee.SSN Employee,Dno DepartmentDnumber Department.Manager_SSN Employee.SSN Works_ON.ESSN Employee.SSN works. On.Pno ProjectPnumber Dependent.ESSN Employee.SSN