What is an associative entity? What four conditions should exist in order to convert a relationship to an associative entity?
What will be an ideal response?
An associative entity is an entity type that associates the instances of one or more entity types and contains attributes that are peculiar to the relationship between those entity instances. Often, a many-to-many relationship is converted to an associative entity. The following four conditions should exist in order to do this:
1. All the relationships for the participating entities types are many relationships.
2. The resulting associative entity has independent meaning.
3. The associative entity has one or more attributes other than the identifier.
4. The associative entity participates in one or more relationships independent of the entities in the associative relationship.
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