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System development/course/data items, attributes and relations

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Relations

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Draw together with the student some examples on a whiteboard or piece of paper. Explain what questions you should ask yourself to make the right decision about how a relation should be build in Triggre.

Possible examples are:

  • Order – Orderrule
    • Start with a one to many relation.
  • Employee – Project
    • Then explain the many to many relation.
  • Person – LastName
    • In a lot of applications the relation between Person and LastName will be a 1-1 relation, LastName is an attribute of Person.
    • In SAP the lastname is registered in infotype 0002, see http://nl.sap.wikia.com/wiki/IT0002 for screenshot. At the top of the screen you can register a start an end date. Now the relation is a 1 to many relation.
  • Person – Address
    • In a lot of applications the relation between Peson and Address will be a 1-1 relation.
    • In an eHRM portal however you want to give your employees the opportunity to register their future move to a new house in advance. So you need a many to many relation.

* Employee – Person

    • Also add the concepts: Applicant, Contact.
  • Leasecare – driver
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