Given the basic ER and relational models, which of the following is INCORRECT?

Q. Given the basic ER and relational models, which of the following is INCORRECT?

A. An attribute of an entity can have more than one value B. An attribute of an entity can be composite C. In a row of a relational table, an attribute can have more than one value D. In a row of a relational table, an attribute can have exactly one value or a NULL value

Similar Questions

1. In the relational modes, cardinality is termed as:

A. Number of tuples. B. Number of attributes. C. Number of tables. D. Number of constraints.

2. . In an E-R diagram attributes are represented by

A. rectangle B. square C. ellipse D. triangle

3. In an E-R diagram an entity set is represent by a

A. rectangle B. ellipse C. diamond box. D. circle

4. E-R model uses this symbol to represent weak entity set ?

A. Dotted rectangle. B. Diamond C. Doubly outlined rectangle D. None of these

5. What is a relationship called when it is maintained between two entities?

A. Unary B. Binary C. Ternary D. Quaternary

6. A set of possible data values is called

A. attribute B. degree C. tuple D. domain

7. Which of the following is another name for weak entity?

A. Child B. Owner C. Dominant D. All of the above

8. In E-R Diagram relationship type is represented by

A. Ellipse B. Dashed ellipse C. Rectangle D. Diamond

9. In E-R diagram generalization is represented by

A. Ellipse B. Dashed ellipse C. Rectangle D. Triangle

10. A relational database consists of a collection of

A. Tables B. Fields C. Records D. Keys

DATABASE MANAGEMENT SYSTEM TOPICS