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(Database Desgin: Relational calculus) Express query (a) below in tuple relational calculus. Use the database schemaprovide here. a. Retrieve the names of departments that control

(Database Desgin: Relational calculus)

Express query (a) below in tuple relational calculus. Use the database schemaprovide here.

a. Retrieve the names of departments that control all projects listed in the Project table.

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Figure 5.7 Referential integrity constraints displayed on the COMPANY relational database schema. EMPLOYEE Fname Minit Lname Ssn Bdate Address Sex Salary Super_ssnDno DEPARTMENT Dname Dnumber Mgr ssn Mgr_start_date DEPT LOCATIONS Dnumber Dlocation PROJECT Pname Pnumber Plocation Dnum WORKS_ON Essn Pno Hours DEPENDENT Essn Depnenname Sex Bdate Relationship

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