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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Inferring Cardinalities<br />
We can construct paths between entity types<br />
These paths represent relationships<br />
composed from series of the existing<br />
relationships<br />
Their cardinalities can be inferred<br />
Spring 2002 <strong>CSC</strong> <strong>742</strong>: DBMS by <strong>Dr</strong>. <strong>Peng</strong> <strong>Ning</strong> 15<br />
Fan Traps<br />
Situations where the inferred, i.e., implied,<br />
cardinality is weaker than the actual<br />
cardinality<br />
Spring 2002 <strong>CSC</strong> <strong>742</strong>: DBMS by <strong>Dr</strong>. <strong>Peng</strong> <strong>Ning</strong> 16<br />
8
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