19.18 - Calculate the cost of functions for different options of executing the JOIN operation OP7 discussed in section 19.4.
OP7: DEPARTMENT JOIN Mgr_ssn=Ssn EMPLOYEE
EMPLOYEE Fname Minit Lname Ssn Bdate Address Sex DEPARTMENT Dname Dnumber Mgr_ssn Mgr_start_date DEPT_LOCATIONS Dnumber Dlocation PROJECT Pname Pnumber Plocation Dnum WORKS ON Essn Pno Hours DEPENDENT Essn Dependent_name Sex Bdate Relationship Salary Super_ssn Dno Figure 5.5 Schema diagram for the COMPANY relational database schema.
EMPLOYEE Fname Minit Lname Ssn Bdate Address Sex DEPARTMENT Dname Dnumber Mgr_ssn Mgr_start_date DEPT_LOCATIONS Dnumber
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EMPLOYEE Fname Minit Lname Ssn Bdate Address Sex DEPARTMENT Dname Dnumber Mgr_ssn Mgr_start_date DEPT_LOCATIONS Dnumber
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