Computer Science · Database Management System
Which of the following describes the key constraint (Primary Key constraint) in a database?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1A primary key and a foreign key cannot both be present in the same table.
- 2The value of a foreign key cannot be zero.
- 3A table cannot have more than one candidate key.
- 4The value of the primary key must be unique and identify rows uniquely.✓
Correct answer
The value of the primary key must be unique and identify rows uniquely.
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