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boyob89 boyob89
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7 years ago
When selecting an identifier, one should:
A) use large composite keys instead of single-attribute surrogate keys
B) use intelligent keys
C) choose a candidate key that will not change its value over the life of each instance of the entity type
D) choose a candidate key such that for each instance of the entity, the attribute is guaranteed to have valid values or is null
Textbook 
Modern Systems Analysis and Design

Modern Systems Analysis and Design


Edition: 4th
Authors:
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Majoring in Economics, minoring in business
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MartyJayMartyJay
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7 years ago
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boyob89 Author
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#2
7 years ago
finally Slight Smile

thx for your expertise
Majoring in Economics, minoring in business
wrote...
#3
7 years ago
Glad I could help
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