Bsc (Hons) Software Engineering. Examinations for / Semester 1. Resit Examinations for BSE/15A/FT & BSE/16A/FT

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Bsc (Hons) Software Engineering Cohort: BSE/16B/FT Examinations for 2017-2018 / Semester 1 Resit Examinations for BSE/15A/FT & BSE/16A/FT MODULE: DATABASE APPLICATION DEVELOPMENT MODULE CODE:

1 Bsc (Hons) Software Engineering Cohort: BSE/16B/FT Examinations for / Semester 1 Resit Examinations for BSE/15A/FT & BSE/16A/FT MODULE: DATABASE APPLICATION DEVELOPMENT MODULE CODE: DBT2113C Duration: 3 Hours Instructions to Candidates: 1. ATTEMPT ALL QUESTIONS 2. All questions DO NOT carry equal marks 3. Questions may be answered in any order but your answers must show the question number clearly. 4. Always start a new question on a fresh page. 5. Total marks 100. This question paper contains 4 questions and 14 pages. Page 1 of 14

2 QUESTION 1: (24 MARKS) This question refers to the database Schema given in the Appendix. (a) Write the SQL code that will create the EMPLOYEE table as per the data description given below. Your answer should also contain the following constraints assuming the table Jobs and Departments have already been created: Column_name Constraint Constraint Name Referencing Table Employee_ID Primary Key Emp_ID_PK Job_ID Foreign key Job_ID_FK Jobs Department_ID Foreign Key Dept_ID_FK Departments Last_name Not Null LName_NN Not Null _NN Hire_Date Not Null HDate_NN Job_ID Not Null Job_ID_NN (10 Marks) (b) Assuming that all the tables have been created as given in the relational schema in the Appendix, write SQL code to make the following changes in the structure of the tables. (i) Create a Foreign Key constraint of name EMP_MGR_ID_FK for the MANAGER_ID column which references the Employee_ID in the Employees table (3 Marks) Page 2 of 14

3 (c) (ii) Add a constraint for the column for each employee so that no two employees would have the same Address. (2 Marks) Write SQL code to insert a new row in the Countries table with the value given below: (2 Marks) COUNTRY_ID COUNTRY_NAME REGION_ID MU Mauritius 4 (d) (e) Write SQL code to change the Manager ID to 115 for the Purchasing Department. (2 Marks) Create a User having Username as TOM and the password will be TOMMY. Then assign the following privileges to TOM: (i) Tom can retrieve all records from the Departments Table. (ii) Tom can Insert any record into the Departments Table. (iii) Tom can Update only the department_name in the Departments Table. (5 Marks) Page 3 of 14

QUESTION 2: (22 MARKS) This question refers to the database Schema given in the Appendix.

Write SQL Code to perform the following queries: (a) Display unique listing of department_id from the

(2 Marks) (b) Display the first name, last name, hire date, job_id and salary of all employees who are

4 QUESTION 2: (22 MARKS) This question refers to the database Schema given in the Appendix. Part of the expected result set is displayed below each question. Write SQL Code to perform the following queries: (a) Display unique listing of department_id from the Employees table. (2 Marks) (b) Display the first name, last name, hire date, job_id and salary of all employees who are getting a salary greater than $10,000 and working as manager. (Hint: JOB_ID contains MAN). (3 Marks) (c) Display the first name, last name, hire date, job id and commission_pct for all employees who are getting a commission and were hired in the year (3 Marks) Page 4 of 14

(d) Display first name, last name, hire date and the years of experience of all employees working in

(3 Marks) (e) Display the last name of all employees who are working as IT_Programmer concatenated

(3 Marks) (f) Display the employee last name, job ID, and Hire date of employees hired between

5 (d) Display first name, last name, hire date and the years of experience of all employees working in department_id 10. (3 Marks) (e) Display the last name of all employees who are working as IT_Programmer concatenated with the job ID, separated by a comma and space, and name the column Employee and Title. (3 Marks) (f) Display the employee last name, job ID, and Hire date of employees hired between February 20,1998, and May 1, Order the query in descending order by Hire date. (4 Marks) (g) Get the maximum salary of employees expressed as a currency for each department. (4 Marks) Page 5 of 14

Write SQL Code to perform the following queries: (a) Display the last name, job id, department id, and department name for all employees

6 QUESTION 3: (24 MARKS) This question refers to the database Schema given in the Appendix. Part of the expected result set is displayed below each question. Write SQL Code to perform the following queries: (a) Display the last name, job id, department id, and department name for all employees who work in the IT department in the city of Toronto. (5 Marks) (b) Display all the department names found in the European region by making use of a sub-query. (6 Marks) (c) Write a query to display the number of employees with the same job. (3 Marks) Page 6 of 14

Exclude any group where the minimum salary is less than $6,000.

7 (d) Display the manager ID and the minimum salary of the employee for that manager. Exclude anyone whose manager id is not known. Exclude any group where the minimum salary is less than $6,000. Sort the output in descending order of salary. (5 Marks) (e) Display the last name and salary of every employee who reports to King. (5 Marks) Page 7 of 14

QUESTION 4: (30 MARKS) This question refers to the database Schema given in the Appendix. The department form below is used to create a new Department and Update or Delete an existing Department.

8 QUESTION 4: (30 MARKS) This question refers to the database Schema given in the Appendix. The department form below is used to create a new Department and Update or Delete an existing Department. When the form is loaded, it shows two blocks namely department_block and departments_view_block. The main purpose of the Departments_view_block is to show the list of available departments. (a) The above form has some issues in terms of BUTTON design. Any user clicking on the SAVE, UPDATE or the DELETE button, will result in a runtime error. Explain how you will change the BUTTON design so as to avoid the runtime errors. (5 Marks) (b) Explain what other changes are required in the form to successfully insert a new record. (2 Marks) Page 8 of 14

9 (c) The name of the blocks and its items name are also given below. Write PL/SQL code to perform the following actions: (i) Create a sequence of name Dept_ID_Sequence that will start with 110 and will increment the value by 10. (2 Marks) (ii) The NEW button when clicked should display the sequence value in the department_id textbox. (3 Marks) (iii) The SAVE button when clicked should save the record in the DEPARTMENTS table. The code should also cater for showing the values in the DEPARTMENTS_VIEW_BLOCK once the record is inserted successfully. It should also display an appropriate message in the status bar of the form as shown on the next page. (6 Marks) Page 9 of 14

10 (iv) The UPDATE button when clicked should update the record in the DEPARTMENTS table. The code should also cater for showing the updated values in the DEPARTMENTS_VIEW_BLOCK once the record is updated successfully. The code should also display an appropriate message in the status bar of the form. (7 Marks) (v) The DELETE button when clicked should delete the record in the DEPARTMENTS table. The code should also cater for removing the deleted values from the DEPARTMENTS_VIEW_BLOCK once the record is deleted successfully. The code should also display an appropriate message in the status bar of the form. (5 Marks) Page 10 of 14

11 APPENDIX The following relational schema only shows sample values for each table. 1. REGIONS TABLE: SELECT * FROM REGIONS; 2. COUNTRIES TABLE: SELECT * FROM COUNTRIES; Page 11 of 14

12 3. LOCATIONS TABLE: SELECT * FROM LOCATIONS: 4. DEPARTMENTS TABLE: SELECT * FROM DEPARTMENTS; Page 12 of 14

13 5. EMPLOYEES TABLE: SELECT * FROM EMPLOYEES Page 13 of 14

14 6. JOBS TABLES: SELECT * FROM JOBS; ***END OF QUESTION PAPER*** Page 14 of 14

Database Foundations. 6-4 Data Manipulation Language (DML) Copyright 2015, Oracle and/or its affiliates. All rights reserved.

Database Foundations. 6-4 Data Manipulation Language (DML) Copyright 2015, Oracle and/or its affiliates. All rights reserved. Database Foundations 6-4 Roadmap You are here Introduction to Oracle Application Express Structured Query Language (SQL) Data Definition Language (DDL) Data Manipulation Language (DML) Transaction Control