When transforming supertype/subtype entities into a relational database design,the key of the supertype table is placed into the subtype table typically as the key.

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This is known as the subtype discriminator, which is used to identify which subtype a record belongs to. The key of the supertype table may also be included in the subtype table as a foreign key.

When Transforming Supertype/subtype Entities into a Relational Database Design,the Key