More use cases of subtypes
|Introduction of the case of indirect multiple references, recursive subtypes, entity specialization, and mention of the usage cases of elimination of unwanted relations through compound foreign keys (though not studied).|
|This class only has written material.
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In the “What are subtypes?” video we saw the concept of subtype, supratype, group of subtypes based on a single usage case: the multiple reference from one transaction to another. Other usage cases were also presented. We study them here, in addition to presenting other cases.