Which of the following keys is used to uniquely identify each record in a…
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Which of the following keys is used to uniquely identify each record in a table and cannot contain a NULL value?
Answer: C. Primary Key — In a relational database, the Primary Key is used to uniquely identify each record in a table. It must contain unique values and cannot contain NULL values,…
- A.
Foreign Key
- B.
Candidate Key
- C.
Primary Key
- D.
Composite Key
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Correct answer: C
In a relational database, the Primary Key is used to uniquely identify each record in a table. It must contain unique values and cannot contain NULL values, ensuring data integrity and enabling relationships between tables.
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