ICS324-Database Systems
Fall Semester 071
Quiz # 1 A
ID:
Name:
Question # 1 [4 points]
Consider the relation:
STUDENT (ID, Name, Major).
Give all the possible super keys
Question # 2 [4 points]
Find two candidate keys for the relation:
CLASS (Course, Section#, Instructor, Location, Time, Weekdays).
Question # 3 [12 points]
Match each term with the appropriate definition:
Term
Definition
1. Catalog
A collection of related data
2. Data Model
An attribute or set of attributes within one relation that
matches a candidate key of some (possibly same) relation.
3. Database
Collection of concepts used to describe the structure of
a database.
4. Database
handles database accesses at run time; it receives
Schema
retrieval or update operations and carries them out on
the database
5. Database State
If foreign key exists in a relation, either the foreign key
value must match a candidate key value of some tuple in
its home relation or foreign key value must be null.
6. Entity Integrity
No attribute of a primary key can be null.
Constraint
7. Foreign Key
The candidate key that is selected to identify tuples
uniquely within the relation.
8. Logical Data
The capacity to change the conceptual schema without
Independence
having to change external schemas or application
programs
9. Physical Data
The capacity to change the internal schema without
Independence
having to change the conceptual (or external) schemas
10. Primary Key
The component of DBMS in which the description of
schemas is stored
11. Referential
The data in the database at a particular moment in time
Integrity
Constraint
12. Run-Time
The description of the database
Database
Processor