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Bmit 216: Database Management Systems Question Paper
Bmit 216: Database Management Systems
Course:Bachelor Of Business Management And Information Technology
Institution: Kabarak University question papers
Exam Year:2009
COURSE CODE: BMIT 216
COURSE TITLE: DATABASE MANAGEMENT
SYSTEMS
STREAM: Y2S1
DAY: FRIDAY
TIME: 9.00 – 12.00 P.M.
DATE: 07/08/2009
INSTRUCTIONS:
Answer question ONE and any OTHER THREE
QUESTION ONE (40mks)
a) Explain the following terms
i) Database Management System
ii) Weak Entity
iii) Tuple
iv) Relation
v) Attribute [5mks]
b) Give and explain
i) Four Disadvantages of file based system [4mks]
ii) Four advantages of a DBMS [4mks]
iii) One disadvantage of a DBMS [1mk]
c) Give the different types of software Development lifecycle models [2mks]
d) What it is conceptual database design [1mk]
e) What is the use of a document flow diagram [2mks]
f) Give the different symbols that represents the components of a data flow
Diagram. [2mks]
g) A table for storing employee’s records in a database had the following data.
STAFF
Staff_No F_Name L_Name Position Gender D_O_B
Sl02 John Kingori Manager M 13TH /3/1985
Sg37 Steve KipKorir Supervisor M 13TH /3/1985
Sg14 Susan Mutua Driver F 13TH /3/1985
Sc26 Steve Kingori Driver M
i) Which of the fields on the table is most likely to be the primary key
and why? [3mks]
ii) Write an SQL statement that will produce from the table a list of all staff’s
showing the Staff number, Last Name and first names only [3mks]
iii) Write an SQL statement that will produce the same list but with the Last
Name and First Name combined as Staff Names [4mks]
iv) Use an Sql statement to find the details of all supervisors [2mks]
Write a statement that would count the different types of positions for the
employees [3mks]
h) Differentiate between An entity-type and an entity instance. [2mks]
i) What is database security [2mks]
QUESTION TWO 20MKS
a) Differentiate between a primary key and a candidate key [2mks]
b) Explain the two components of multiplicity integrity [4mks]
c) The following schema shows how the details about students and subjects are
stored in a school database system. The students are supposed to select which
subjects to study while at school. A student can select at least four subjects and at
most seven subjects.
STUDENT (Student_Id,Family_Name,Last_Name,Sex)
SUBJECT(Subject_Code,Subject_Title, Lessons_per_week)
i) Draw an appropriate E-R diagram showing the relationship between the student
and the subject’s entity types [3mks]
ii) State the cardinality of the relationship [1mk]
iii) Write an SQL statements for creating the two tables in an SQL Server
database [6mks]
d) Use an SQL statement to insert an appropriate record into the students table
[2mks]
e) Redraw the E-R diagram to include the examination and assignment records in
to the database. [2mks]
QUESTION THREE 20MKS
Discuss the different stages of database system life cycle. [20mks]
QUESTION FOUR 20MKS
a) What is normalization [2mks]
b) Explain the first three normal forms [6mks]
c) Explain two ways that normalization is used in database design [4mks]
d) Discuss any two anomalies that arise when data is not normalized [4mks]
e) The following table is in which normal form? Explain your answer [4mks]
Exam Table
Student number Course code Course title c.f marks
QUESTION FIVE 20MKS
a) Explain the following terms
i) Data Mappings [2mks]
ii) Data modeling [1mk]
b) Discuss the different types of data independence [6mks]
c) Differentiate between a relation and a relationship in a relational database [2mks]
d) Discuss the three levels of data abstraction [9mks]
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