Frage | Antworten |
What is an entity type? | Represents a physical or abstract concept with some sort of identity and some descriptive features. |
What is an attribute? | The descriptive features of entities are called attributes. |
What is an entity? | Corresponds to a set of entities having the same set of attributes. |
What is a relationship type? | Represents a connection between two or more entity types. |
What is a key? | An attribute that has unique values for every instance of an entity type. |
What is a weak entity type? | Those that are meaningless without an owner entity type. |
Möchten Sie mit GoConqr kostenlos Ihre eigenen Karteikarten erstellen? Mehr erfahren.