DBMS-Entity Relationship (E-R) Model
DBMS-Entity Relationship (E-R) Model
31. Which data model is independent of both hardware and DBMS?
- External
- Internal
- conceptual
- all of these
32. A relatonship between the instances of a single entity type is called.
- binary relationship
- ternary relationship
- recursive relationship
- none of these
33. A simple attribute is composed of :
- single component with an independent existence.
- multiple components, each with an independent existence.
- both (a) and (b)
- none of these
34. A composite attribute is composed of:
- single component with an independent existence.
- multiple components, each with an independent existence
- both (a) and (b)
- none of these
36. The attribute composed of a single component with an independent existence is called:
- composite attribute
- atomic attribute
- single-valued attribute
- derived attribute
37. The attribute composed of multiple components, each with an independent existence is called.
- composite attribute
- simple attribute
- single-valued attribute
- derived attribute
38. Which of these express the specific number of entity occurrences associated withone occurrence of the related entity ?
- degree of relationship.
- connectivity of relationship
- cardinality of relationship
- none of these.