∪ / \ π π / \ σ σ / \ / \ Dname > Dname > = 30000 = / \ / \ / \ Employee DNO Dnumber Pname = = = / \ / \ / \ SSN Lname Dnum salary > = / \ Project Reorganization Computerization
∪ / \ π π / \ σ σ / \ / \ Dname > Dname > = 30000 = / \ / \ / \ Employee DNO Dnumber Pname = = = / \ / \ / \ SSN Lname Dnum salary > = / \ Project Reorganization Computerization