1. WEEK 3 Relational Data Model Concepts:
summary
Real-life example
quiz
 Concept of Database Constraints:
 Types of Constraints:
Domain Con/ Entity integrity Con/ Key Con/ Referential integrity Con.
 Concept of Database Integrity:
Data Int/ Referential Int/ Entity Int/ User-defined Int
 Concept of Relational Algebra:
 Kinds of Unary Operations:
 Kinds of Binary Operations:

2. WEEK 3 Relational Data Model Concepts:
summary
Real-life example
quiz

3. WEEK 3 Relational Data Model Concepts:
summary
Real-life example
quiz
1. Which in the following is not among Database constraints :
A. Cardinality constraints
B. Domain constraints
C. Entity integrity constraints
D. Key constraints
E. Referential integrity constraints
2. What ensures that data entered into the database is accurate, valid, and
consistent:
A. Operational component
B. Integrity component
C. Structural component
D. Database schema
E. Database integrity
F. Data component
Enter answer,,,.

4. WEEK 3 Relational Data Model Concepts:
summary
Real-life example
quiz
1. Which in the following is not among Database constraints :
A. Cardinality constraints
B. Domain constraints
C. Entity integrity constraints
D. Key constraints
E. Referential integrity constraints
2. What ensures that data entered into the database is accurate, valid, and
consistent:
A. Operational component
B. Integrity component
C. Structural component
D. Database schema
E. Database integrity
F. Data component
answer is:
1. A
2. E

5. WEEK 3 Relational Data Model Concepts:
summary
Real-life example
quiz
3. It the referential integrity is a database concept that ensures that relationships
between tables remain consistent:
A. True
B. False
4. In Mapping of weak entity types to-relational model:
A. Each weak entity type, becomes a new field
B. Each weak entity type, becomes a new attribute
C. Each weak entity type, becomes a new row
D. Each weak entity type, becomes a new relation
E. Each weak entity type, becomes a new column
5. Select operation is used to select a subset of the tuples from a relation that satisfy
a selection condition:
A. True
B. False
Enter answer,,,.

6. WEEK 3 Relational Data Model Concepts:
summary
Real-life example
quiz
3. It the referential integrity is a database concept that ensures that relationships
between tables remain consistent:
A. True
B. False
4. In Mapping of weak entity types to-relational model:
A. Each weak entity type, becomes a new field
B. Each weak entity type, becomes a new attribute
C. Each weak entity type, becomes a new row
D. Each weak entity type, becomes a new relation
E. Each weak entity type, becomes a new column
5. Select operation is used to select a subset of the tuples from a relation that satisfy
a selection condition:
A. True
B. False
answer is:
3. A
4. D
5. A