Question 1 :
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.
Question 2 :
A ternary relationship is so called because in contains two entities and one association between them.
Question 3 :
All instances of an entity class have the same attributes.
Question 4 :
A minimum cardinality is the minimum number of entity instances that may participate in a relationship instance.
Question 5 :
An attribute describes the entity's characteristics.
Question 6 :
The degree of a relationship refers to the number of entity classes in the relationship.
Question 7 :
Entities use identifiers while tables use keys.
Question 8 :
Composite identifiers consist of two or more attributes.
Question 9 :
When designing a database, first identify the entities, then determine the attributes, and finally establish the relationships.
Question 10 :
A subtype entity is a special case of another entity called a supertype entity.
Question 11 :
An entity is something that can be identified in the user's work environment; something that the users want to track.
Question 12 :
Entity instances are associated by relationship classes.
Question 13 :
1:1, 1:N and N:M relationships are also known as HAS-A relationships.
Question 14 :
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.
Question 15 :
A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.
Question 16 :
An entity class is a collection of entities and is described by the structure of the entities in that class.
Question 17 :
Relationship classes are associations between entity classes.
Question 18 :
An identifier typically uses more than one attribute.
Question 19 :
An identifier determines the type of relationship that an entity has.
Question 20 :
A recursive relationship is a relationship between an archetype and an instance of that archetype.