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Exam Paper: Database Technologies, Autumn Examinations, 2010, NUI Galway, Exams of Data Communication Systems and Computer Networks

Banasthali VidyapithData Communication Systems and Computer Networks

An exam paper from the national university of ireland, galway, for the modules database technologies in the bachelor of science in business information systems, bachelor of commerce, and bachelor of commerce (international) programs. The exam covers topics such as referential integrity, entity integrity, unique fields, required fields, validation rules, one-to-one and many-to-many relationships, transaction processing model, and sql commands. Instructions, exam codes, module codes, exam duration, and department information.

Typology: Exams

2011/2012

Uploaded on 11/26/2012

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Ollscoil na hÉireann, Gaillimh GX_____
National University of Ireland, Galway
Autumn Examinations, 2010
Exam Code(s) 2BF1
3BC1
4BC2, 4BC3, 4BC4, 4BC5
Exam(s) Bachelor of Science in Business Information Systems
Bachelor of Commerce
Bachelor of Commerce (International)
Module Code(s) MS218
Module(s) Database Technologies
External Examiner(s) Dr. Danail Ivanov
Internal Examiner(s) Dr. Thomas Acton
Dr. Michael Lang
Instructions Answer Question 5 and any other 2 questions.
Duration 2½ hours
FOR INFORMATION OF EXAMINATIONS OFFICE ONLY
Paper No. 1 of 1
Repeat Paper N/A Special Paper N/A
No. of Answer Books N/A
Requirements
Handout None
MCQ None
Statistical Tables None
Graph Paper None
Log Graph Paper None
Other Material None
No. of Pages 5
Department(s) Business Information Systems
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pf5

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Ollscoil na hÉireann, Gaillimh GX_____ National University of Ireland, Galway Autumn Examinations, 2010 Exam Code(s) 2BF 3BC 4BC2, 4BC3, 4BC4, 4BC Exam(s) Bachelor of Science in Business Information Systems Bachelor of Commerce Bachelor of Commerce (International) Module Code(s) MS Module(s) Database Technologies External Examiner(s) Dr. Danail Ivanov Internal Examiner(s) Dr. Thomas Acton Dr. Michael Lang Instructions Answer Question 5 and any other 2 questions. Duration 2½ hours FOR INFORMATION OF EXAMINATIONS OFFICE ONLY Paper No. 1 of 1 Repeat Paper N/A Special Paper N/A No. of Answer Books N/A Requirements Handout None MCQ None Statistical Tables None Graph Paper None Log Graph Paper None Other Material None No. of Pages 5 Department(s) Business Information Systems

Answer QUESTION FIVE and any other TWO questions

  1. (a) An essential requirement of a database management system (DBMS) is that it should assure data integrity. Describe clearly what is meant by the following terms, and how each of these considerations are handled within relational DBMSs:  Referential integrity  Entity integrity  Unique fields  Required fields (15 marks) (b) Describe how validation rules based on the SQL keywords LIKE and IN can be defined when creating tables in SQL. (10 marks)
  2. (a) Describe how one-to-one (1:1) and many-to-many (M:M) relationships are implemented in a relational database. (You may omit recursive relationships). (18 marks) (b) Describe how a recursive one-to-many (1:M) relationship would be implemented in a relational database. (7 marks)
  3. (a) Outline the ANSI / ISO Transaction Processing Model and its popular variants. (9 marks) (b) Explain, using examples, how “insert” and “delete” anomalies can arise in Second Normal Form (2NF) where transitive dependencies are seen to exist. (16 marks)
  4. “ Social networking technologies potentially constitute a serious threat to individual privacy, personal safety and organisational data security .” Critically discuss this statement.

f) What is the full name of the youngest manager? [Use subqueries] (5 marks) g) List the names of all employees who have started work since March 2005 ( Start_Date ) who are older than their managers. [Use a self-join] (8 marks) h) If you were to count how many customers there are from each country, which country would be the most represented? You should code the query so that it automatically excludes all countries from which there are less than 5 customers. (8 marks) i) Sarah Mulholland ( Employee_Number 10342) is leaving the company today. She is being immediately replaced by Matthew Duffy whose new employee number and email address are 16273 and “[email protected]” respectively. His manager and telephone extension are the same as the person he is replacing, and his date of birth is 24 th April 1975. Implement the necessary changes in the correct order. (8 marks) (Total marks for Question 5: 50 marks)