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Database Systems: Concepts, Design and Applications by S. K. Singh

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Tick (✓) the Appropriate Answer

1.E-R Model was introduced by:
  1. Dr. E.F. Codd.

  2. Boyce.

  3. P.P Chen.

  4. Chamberlain.

2.An association among three entities is called:
  1. binary relationship.

  2. ternary relationship.

  3. recursive relationship.

  4. none of these.

3.The association between the two entities is called:
  1. binary relationship.

  2. ternary relationship.

  3. recursive relationship.

  4. none of these.

4.Which data model is independent of both hardware and DBMS?
  1. external.

  2. internal.

  3. conceptual.

  4. all of these.

5.A relationship between the instances of a single entity type is called:
  1. binary relationship.

  2. ternary relationship.

  3. recursive relationship.

  4. none of these.

6.A simple attribute is composed of:
  1. single component with an independent existence.

  2. multiple components, each with an independent ...

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