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boyob89 boyob89
wrote...
Posts: 4396
7 years ago
Which of the following specifies that each instance of an entity type must have a unique identifier that is not null?
A) referential integrity constraints
B) domains
C) triggering operations
D) entity integrity
Textbook 
Modern Systems Analysis and Design

Modern Systems Analysis and Design


Edition: 4th
Authors:
Read 109 times
3 Replies
Majoring in Economics, minoring in business
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Answer verified by a subject expert
MartyJayMartyJay
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Posts: 4390
7 years ago
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boyob89 Author
wrote...
7 years ago
finally Slight Smile

thx for your expertise
Majoring in Economics, minoring in business
wrote...
7 years ago
I’m happy to help Slight Smile
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