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Title: Explain the two criteria that help a designer in determining when to use subtypes and supertypes. Post by: nramos08 on Jan 30, 2018 Explain the two criteria that help a designer in determining when to use subtypes and supertypes.
Title: Explain the two criteria that help a designer in determining when to use subtypes and supertypes. Post by: red ridinghood on Jan 30, 2018 Two criteria help a designer determine when to use subtypes and supertypes:
1 . There must be different, identifiable kinds or types of an entity in the user's environment. 2 . The different kinds or types of instances should each have one or more attributes that are unique to that kind or type of instance. |