CSC 742 Database Management Systems Phases ... - Dr. Peng Ning
CSC 742 Database Management Systems Phases ... - Dr. Peng Ning
CSC 742 Database Management Systems Phases ... - Dr. Peng Ning
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Structure<br />
Hierarchy: single inheritance<br />
Lattice: multiple inheritance<br />
Shared subclass<br />
Attribute inheritance<br />
Single inheritance: trivial<br />
Multiple inheritance<br />
Spring 2002 <strong>CSC</strong> <strong>742</strong>: DBMS by <strong>Dr</strong>. <strong>Peng</strong> <strong>Ning</strong> 31<br />
Union Types<br />
Category<br />
A subclass of the Union of some entity<br />
types<br />
A category has two or more super-classes<br />
Different from generalization.<br />
Spring 2002 <strong>CSC</strong> <strong>742</strong>: DBMS by <strong>Dr</strong>. <strong>Peng</strong> <strong>Ning</strong> 32<br />
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