Consider two entity sets A and B that both have the attribute X a. If the two
Question:
Consider two entity sets A and B that both have the attribute X
a. If the two Xs are completely unrelated, how should the design be improved?
b. If the two Xs represent the same property and it is one that applies both to
A and to B, how should the design be improved? Consider three subcases:
• X is the primary key for A but not B
• X is the primary key for both A and B
• X is not the primary key for A nor for B
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Related Book For
Database System Concepts
ISBN: 9780078022159
7th Edition
Authors: Abraham Silberschatz, Henry F. Korth, S. Sudarshan
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