BSc (Hons) Software Engineering. BSc (Hons) Computer Science with Network Security. Examinations for / Semester 2 & 2017 / Semester 1

Transcription

1 BSc (Hons) Software Engineering BSc (Hons) Computer Science with Network Security Cohort: BSE/16B/FT & BCNS/17A/FT Examinations for / Semester 2 & 2017 / Semester 1 Resit Examinations for BCNS/14B/FT, BSE/14B/FT, BSE/15B/FT, BSE/16A/FT, BCNS/16B/FT, BSE/15A/FT & MODULE: DATABASE DESIGN MODULE CODE: DBT 1111C Duration: 2 Hours 30 Minutes BCNS/15B/FT Instructions to Candidates: 1. Answer all questions. 2. Questions may be answered in any order but your answers must show the question number clearly. 3. Always start a new question on a fresh page. 3 marks will be deducted if this is not respected. 4. Total marks 100. This question paper contains 4 questions and 9 pages. Page 1 of 9

2 QUESTION 1: (20 MARKS) For the following 20 Multiple Choice questions, choose the best answer and record it on the MCQ Answer Sheet provided. Every correct answer brings 1 mark. 1) Format or data type must be specified for A. table ender B. entity domain C. range D. domain 2) Multi-valued dependencies and functional dependencies are classified as category of A. relation dependencies B. data dependencies C. entity dependencies D. attribute dependencies 3) Multivalued dependencies used to develop relational design theory of database is classified as A. amortization B. normalization C. conceptualization D. depreciation 4) Database system which supports majority of concurrent users is classified as A. multiuser system B. multi-function system C. multi transaction system D. client and disk server system 5) In three-tier architecture, intermediate layer between database and client servers is classified as A. functional server B. transaction server C. application server D. disk server Page 2 of 9

3 6) Architecture of database in which characteristics such as program insulations, multiple user support and use of catalogues are achieved is classified as A. multiple-schema architecture B. single-schema architecture C. two-schema architecture D. three-schema architecture 7) Package of software that facilitate modelling of database and improved performance of database system is classified as A. tools B. tool developers C. programmers D. system tools 8) Type data abstraction which allows conceptual representation of data in database management system is considered as A. logical design model B. data model C. interface model D. user friendly model 9) Access to an online purchasing procedures, airline ticket reservation systems and inventory management in local grocery stores are examples of A. traditional database applications B. record keeping C. customer management D. customer services 10) Process of designing new database or designing new application for database which already exists is classified as A. storage design analysis B. requirement definition C. requirement analysis D. both a and b Page 3 of 9

4 11) Consider the following table: A. The table is in first normal form B. The table is in second normal form C. This table is not normalised D. The table is in third normal form 12) Third Normal Form is designed to A. ensure that the database contains three tables B. ensure that there are no transitional dependencies, i.e. to ensure that there are no dependancies between non-key fields. C. ensure that there are no dependencies between keys and foreign keys D. ensure that a table that is in second normal form is decomposed into two or more tables 13) A one to many relationship (of table A to Table B) is A. Where each record in Table B is required to have a match in table A B. Where each record in table B can have one or more matching records in table A C. Where each record in table A is required to have a match in table B D. Where each record in table A can have one or more matching records in table B 14) Consider the following join. If we want to list all students whether or not they own cars together with all cars owned by students we would A. Join STUDREC to CARS with an equijoin (Inner join) B. Join STUDREC to CARS with a right join C. Join STUDREC to CARS with a left join D. Join CARS to STUDREC with a left join Page 4 of 9

5 15) Assume that Table A is joined to Table B. A one to one join (an inner join or equijoin) A. displays all rows (records) for table B and only those in table A that have a matching value B. displays rows (records) only when the values of the Key in table A and the foreign key in table B are equal. C. displays all rows (records) for table A and only those in table B that have a matching value D. is when table B contains only one matching record for each key in table A. 16) The set of rules that govern the internal validity and consistency of data within a relational database are known as A. rules of data integrity B. rules of data integration C. rules of referential integrity D. rules of referential integration 17) In relational algebra the UNION of two sets (set A and Set B). This corresponds to A. A AND B B. A - B C. A + B D. A OR B 18) In Access a LOOKUP field will A. Only allow the user to select values that already exist within the same table B. Allow the user to input any value, but will store that value in a second table for future reference C. Allow the user to input any value providing that an input mask is stored in a second table D. Only allow the user to input values that already exist in another table Page 5 of 9

6 19) Which of the following statements best describes the function of an entity relation model? A. An ER model is concerned primarily with a physical implementation of the data and secondly with the logical view B. An ER model is concerned primarily with a logical view of the data and secondly with the physical implementation C. An ER model is entirely concerned with modelling the physical implementation D. An ER model provides a view of the logic of the data and not the physical implementation. 20) In formal relational model, set of indivisible values is called A. range B. domain C. relation D. tuple Page 6 of 9

7 QUESTION 2: (25 MARKS) (Start on a fresh page) (a) Entity Relationship Diagrams (ERD) are important in Database Design. List 5 types of attributes when designing an ERD diagram. (5 Marks) (b) UPS prides itself on having up-to-date information on the processing and current location of each shipped item. To do this, UPS relies on a company-wide information system. Shipped items are the heart of the UPS product tracking information system. Shipped items can be characterized by item number (unique), weight, dimensions, insurance amount, destination, shipped date and final delivery date.shipped items are received into the UPS system at a single retail center. Retail centers are characterized by their type, uniqueid, and address. Shipped items make their way to their destination via one or more standard UPS transportation events (i.e., flights, truck deliveries). The UPS transportation event may have a contracted logistic handler which has a company regno, company name and contact. These transportation events are characterized by a unique schedulenumber, a type (e.g, flight, truck), and a deliveryroute. Create a neat Entity Relationship diagram that captures this information about the UPS system. Be certain to indicate identifiers and cardinality constraints. (20 marks) Page 7 of 9

8 QUESTION 3: (25 MARKS) Consider the following tables which form part of the database schema for a University. (Primary Keys are underlined; Foreign Keys are italicized): University (UID, name, location, country) Department (DepartmentID, DName, DCapacity) Lecturer (LecturerID, Fname, LName, LPosition, LSalary, DepartmentID, ModuleID) Student (StudentID, SSurname, SName, SAddress, SContactnum, CourseID, ModuleID) Module (ModuleID, MName, MRequirements) Course (CourseID, ModuleID, LecturerID, CDescription, comment) Formulate the following queries using SQL statements: (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) Create only the table Lecturer initializing the primary, foreign and NOT NULL constraints. [5 Marks] Insert a new row into Lecturer table supplying the following data (LecturerID: 2701, FName: Zarah, LName: Jeh, LPosition: Lecturer, LSalary: 175,000, ModuleID: 777, DepartmentID: 2108) [2 Marks] Give all Senior Lecturers a 7% pay increase, [2 Marks] Promote Phillipe Coutinho (LecturerID= 2017) to Associate Professor and change his salary to 275,000. [2 Marks] Delete all courses that relate to module DBT1111C, [2 Marks] Find all modules with the string computer science in their requirements. [3 Marks] Find number of Associate Professors and sum of their salaries, [4 Marks] For each department, list lecturer who teach a module, including the name of the department and modules they are in charge of. [5 Marks] Page 8 of 9

9 QUESTION 4: (30 MARKS) (a) A Database Management System (DBMS) is a set of computer programs that controls the creation, maintenance and the use of the database of an organization and its end users environment. Briefly describe some benefits of the DBMS. [3 Marks] (b) (i) The Three-Schema Architecture defines DBMS schemas at three levels. Describe these three different levels. [6 Marks] (ii) Give three advantages of this architecture. [3 marks] (iii) Describe the meaning and objective of data independence in ANSI-SPARC architecture. [2 marks] (c) (d) Normalization is a technique to organize the contents of tables for databases. (i) Describe FOUR goals of normalization. [4 marks] (ii) What are the undesirable properties for a table in 1NF (First Normal Form)? The following table is part of a delivery note. [ 2 Marks] Num CustName City Country ProdID Description 2016 Jehaan Smith London England WIFI Adapter Mouse Keyboard 2017 Zarah Bill Paris France 2 7 Mouse CPU Normalize the above Table to 3NF, showing all the intermediate normal forms, relations and functional dependencies. Clearly specify all assumptions made. Give the relational schema and tabular forms of tables for each Normal form. ***END OF QUESTION PAPER*** [10 Marks] Page 9 of 9