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

Exercise No. 15: Maintenance

Partial Solution 1

a) A company produces articles (Mat-#), which are classified in consumables (wear parts) and systems (Ser-#). Systems can have several maintenance contracts (Mtn-#).

Systems are identified by a unique key, the Serial Number