Question
(SELECT pnumber

FROM project, department, employee

WHERE dnum=dnumber AND mgr_ssn=ssn AND lname='Smith')

UNION

(SELECT pnumber

FROM project, works_on, employee

WHERE pnumber=pno AND essn=ssnAND lname='Smith')

Can you draw the relation step by step , how to solve it ?!

Figure 5.6 One possible database state for the COMPANY relational database schema. EMPLOYEE Sex Salary Super ssn Dno B Smith 123456789 1965-01-09 731 Fondren, Houston, TX M 30000 3334455555 Ssn Fname Minit Lname John Franklin TWong 333445555 1955-12-08 638 Voss, Houston, TXM40000 888665555 5 AliciaJZelaya 999887777 1968-01-19 3321 Castle, Spring, TX F 25000 987654321 4 Jennifer S Wallace 987654321 1941-06-20 291 Berry. Bellaire, TXF 43000 888665555 4 Ramesh K Narayan 666884444 1962-09-15 975 Fire Oak, Humble, TX M 38000 333445555 5 Joyce A English 453453453 1972-07-31 5631 Rice, Houston, TXF 25000 333445555 5 Ahmad V Jabbar 987987987 969-03-29 980 Dallas, Houston, TX M 25000 987654321 4 James E Borg 888665555 1937-11-10 450 Stone, Houston, TX M 55000 NULL Bdate Address DEPARTMENT DEPT LOCATIONS Dnumber Dlocation Mgr ssn 333445555 987654321 888665555 Mgr start date 1988-05-22 1995-01-01 1981-06-19 5 Houston Administration Headquarters Houston WORKS ON PROJECT Pnumber Plocation Dnum Essn 123456789 123456789 666884444 453453453 453453453 333445555 333445555 333445555 333445555 9998877717 Pno Hours ProductX ProductY Productz Computerization0 Stafford Bellaire 32.5 7.5 40.0 20.0 20.0 10.0 10.0 10 10.0 20 10.0 30 30.0 9998877770 10.0 10 35.0 5.0 30 20.0 15.0 2 Sugarland5 3 20 Houston 30 Stafford Newbenefits DEPENDENT Essn 333445555 Alice 333445555 Theodore 333445555 Joy 98765432 Abner 123456789 Michael 123456789Alice 123456789 Elizabeth Dependent name Sex Bdate Relationship 987987987 987987987 987654321 987654321 888665555 20 NULL F 1986-04-05 Daughter M 1983-10-25 Son F 1958-05-03 Spouse M 1942-02-28 Spouse M 1988-01-04 Son F 1988-12-30Daughter F1967-0505 Spouse 30
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Answer #1

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