Question: An Attribute takes a ________value when an entity does not have a value for it.
Answer:
The Null value may indicate not applicable that is that the value does not exist for the entity, for example one may have no last name ,Null can also designates that an attribute value is not known or may be missing.
MCQ: An Attribute takes a ________value when an entity does not have a value for it.
Explanation:
The Null value may indicate not applicable that is that the value does not exist for the entity, for example one may have no last name ,Null can also designates that an attribute value is not known or may be missing.
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Related Questions
- 1. A______is a set of relationships of the same type among several entities
- 2. The Relationship sets that involve two entity sets in known as___
- 3. The number of Entity sets that participate in a relationship set is know as ____________ of Relationship
- 4. ______ is the restrictions imposed to maintain the data integrity of the database
- 5. For a Binary relationship set R between entity sets A and B, the ________ express the number of entities to which another entity can be associated.
- 6. For a Binary relationship set R between entity sets A and B,the ________ express the number of entities to which another entity can be associated.
- 7. For a binary relationship set R between entity sets A and B, the Mapping Cardinality is ONE TO ONE if
- 8. For a binary relationship set R between entity sets A and B,the Mapping Cardinality is ONE TO MANY if
- 9. For a binary relationship set R between entity sets A and B,the Mapping Cardinality is MANY to ONE if
- 10. For a binary relationship set R between entity sets A and B, the Mapping Cardinality is MANY to MANY if
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