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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Weak Entity Types<br />
No key of its own attributes<br />
Must participate in a total relationship<br />
Another participant of the relationship<br />
becomes the owner<br />
Key = owner's key + partial key<br />
Spring 2002 <strong>CSC</strong> <strong>742</strong>: DBMS by <strong>Dr</strong>. <strong>Peng</strong> <strong>Ning</strong> 19<br />
Summary of ER Diagram Notations<br />
Entity<br />
Weak Entity<br />
Relationship<br />
Identifying Relationship<br />
Attribute<br />
Key Attribute<br />
Multi-valued Attribute<br />
Spring 2002 <strong>CSC</strong> <strong>742</strong>: DBMS by <strong>Dr</strong>. <strong>Peng</strong> <strong>Ning</strong> 20<br />
10
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