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DATABASE-SYSTEMS-1-THEORY (1).pdf
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TERTIARY AND VOCATIONAL EDUCATION COMMISSIONCOMMON WRITTEN EXAMINATION
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NVQ Level 05 - Semester I
Information and Communication Technology
Database Systems - I K72C001M01 Three Hours
* Answer any five (05) questions
Question ( 1 )
a) Briefly explain the following terms
I. Primary Key, Composite Key and Foreign Key (06Marks)
II. File Operations &Ordered File (06Marks)
III. DDL & DML (06Marks)
b) Write two advantages of DBMS (02Marks)
Question ( 2 )
Consider the following information: (20Marks)
In an educational institute, there are several departments and students belong
to one of them.
Each department has a unique department number, a name, a location, phone
number and is headed by a professor.
Professors have a unique employee Id, name, phone number.
We like to keep track of the following details regarding students: name, unique
roll number, sex, date of birth, age and one or more email addresses.
Students have a local address consisting of the hostel name and the room
number. They also have home address consisting of house number, street, city
and PIN. It is assumed that all students reside in the hostels.
Course taught in a semester of the year is called a section. There can be
several sections of the same course in a semester; these are identified by the
section number.
Each section is taught by a different professor and has its own timings and a
room to meet. Students enroll for several sections in a semester. Each course
has a name, number of credits and the department that offers it.
A course may have other courses as pre-requisites i.e, courses to be
completed before it can be enrolled in.
Professors also undertake research projects. These are sponsored by funding
agencies and have a specific start date, end date and amount of money given.
More than one professor can be involved in a project. Also a professor may be
simultaneously working on several projects. A project has a unique projectId
Draw an ER diagram for this system.
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