How in a relation a supertype or subtype is mapped
Explain how in a relation a supertype or subtype is mapped?
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A separate relation is created for each and every supertype and subtype. The attributes general for all of the subtypes are allocated to the supertype. Each and every subtype has the primary key from the supertype assigned to it. A subtype discriminator is added to the supertype.
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Database Requirements Consider a MOVIE database in which data is recorded about the movie industry. The data requirements are summarized as follows: • Each movie is identified by title and year of release. Each movie has a length in minutes. Each has a production company, and each is classifie
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