Studierende stehen vor dem LC und blicken lächelnd einer Kollegin mit einer Mappe in der Hand nach.

ERM Example No. 2

Basic ERM with Cardinalities / Key Attributes

Representation:

A Customer (Cust-#, Name, Address) may purchase (Quantity) one or more Article(s) (Art-#, Art Name, Price). An Article may be purchased by one or more Customer(s).