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pagnor pagnor
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6 years ago
Which of the following is not true about primary keys?
A) Primary keys cannot be null.
B) Primary keys must be unique.
C) Primary keys must be a single attribute.
D) Primary keys are used to represent relationships.
E) Primary keys can be defined using an SQL CONSTRAINT phrase.
Textbook 
Database Concepts

Database Concepts


Edition: 7th
Authors:
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bestavinashbestavinash
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6 years ago
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