Due Thursday November 14, 2013 1. Show the result of the following queries as they would apply to the database of Figure 3.6 on page 72 of your textbook (a) Retrieve the name and address of all employees who work for the ‘research’ department: RESEARCH_DEPT DNAME = ‘Research’(DEPARTMENT) RESEARCH_EMPS (RESEARCH_EPT DNUMBER = DNO EMPLYEE RESULT FNAME, LNAME, ADDRESS(RESEARCH_EMPS) ) (b) For every project located in ‘Stafford’, list the project number, the controlling department number, and the department manager’s last name, address, and the birthdate. STAFFORD_PROJS PLOCATION = ‘Stafford’(PROJECT) CONTR_DEPT (STAFFORD_PROJS PROJ_DEPT_MGR CONTR_DEPT DNUM=DNUMBER DEPARTMENT MGRSSN=SSN EMPLOYEE RESULT PNUMBER,DNUM,LNAME,ADDRESS,BDATE(PROJ_DEPT_MGR) ) ) (C) Retrieve the names of employees who have no dependents. ALL_EMPS SSN(EMPLOYEE) EMPS_WITH_DEPS ESSN(DEPENDENT) EMPS_WITHOUT_DEPS (ALL_EMPS – EMPS_WITH_DEPS) RESULT LNAME, FNAME(EMPS_WITHOUT_DEPS * EMPLOYEE) 2. (30) Specify the following queries on the database schema shown in Figure 3.5, using the relational operators defined in the relational algebra. Also show the result of each query as it would apply to the database of Figure 3.6. a. Retrieve the name of all employees in department 5 who work more than 10 hours per week on the ‘Product X’ project. b. List the names of all employees who have a dependent with the same first name as themselves. c. Find the names of all employees who are directly supervised by ‘Franklin Wong’. d. For each project, list the project name and the total hours per week (by all employees) spent on that project. e. Retrieve the names of all employees who work on every project. 3. (20) Exercise 3.13 on Page 81 Consider the relation CLASS(Course#, Univ_Section#, InstructorName, Semester, BuildingCode, Room#, TimePeriod, Weekdays, CreditHours). This represents classes taught in a university, with unique Univ_Section#. Identify what you think should be various candidate keys, and write in your own words the constraints under which each candidate key would be valid. 4. (20) Exercise 6.22 on Page 190 Consider the two tables T1 and T2 shown above (Figure 6.15 of your text). Show the results of the following operations: