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CSC 4402 20091026

CSC 4402 20091026 - set Weak entities should have a primary...

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CSC 4402 10/26/2009 Page 1 of 1 Chapter 6 – E-R design process (cont’d) Two ways to define a weak entity set: 1) The entity set does not have a primary key 2) The existence of the entity set depends on the existence of an identifying entity
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Unformatted text preview: set. Weak entities should have a primary key from the dependant table as a foreign key in their base table....
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