Database Management Systems (DBMS)
What does Primary key refer to?
- A. A column or set of columns that uniquely identifies each row in a database table. ✓
- B. The process of intentionally introducing redundancy into a database to improve read performance.
- C. A situation in which two transactions are each waiting for the other to release a lock, preventing progress.
- D. The process of organizing database tables to reduce data redundancy and improve data integrity.
Correct answer
A. A column or set of columns that uniquely identifies each row in a database table.
Explanation
Primary key refers to a column or set of columns that uniquely identifies each row in a database table.