Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).
Database Management SystemDatabase Keys
Primary key:
- A.Can be null
- B.Cannot be duplicated
- C.Uniquely identifies a record
- D.All of theseCorrect answer
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Practice these MCQs in the appQuick fact: A primary key cannot be null, cannot be duplicated, and uniquely identifies each record in a table.