Q.1
Entities of a given type are grouped into a(n):
Q.2
Which of the following is NOT a basic element of all versions of the E-R model?
Q.3
Which of the following indicates the minimum number of entities that must be involved in a relationship?
Q.4
An entity is something that can be identified in the user's work environment; something that the users want to track.
Q.5
Entity instances are associated by relationship classes.
Q.6
1:1, 1:N and N:M relationships are also known as HAS-A relationships.
Q.7
In a 1:N relationship, the parent is the entity on the one side of the relationship and the child is the entity on the N side of the relationship.
Q.8
A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.
Q.9
An entity class is a collection of entities and is described by the structure of the entities in that class.
Q.10
Relationship classes are associations between entity classes.
Q.11
An identifier typically uses more than one attribute.
Q.12
An identifier determines the type of relationship that an entity has.
Q.13
A recursive relationship is a relationship between an archetype and an instance of that archetype.
Q.14
An ID-dependent entity is an entity whose identifier is a composite identifier where no portion of the composite identifier is an identifier of another entity.
Q.15
A ternary relationship is so called because in contains two entities and one association between them.
Q.16
All instances of an entity class have the same attributes.
Q.17
The degree of a relationship refers to the number of entity classes in the relationship.
Q.18
Entities use identifiers while tables use keys.
Q.19
Composite identifiers consist of two or more attributes.
Q.20
A minimum cardinality is the minimum number of entity instances that may participate in a relationship instance.
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