Database Management Systems (DBMS)
What does Primary key refer to?
Difficulty: Easy
About this MCQ
This Easy Database Management Systems (DBMS) MCQ checks one syllabus fact.
The question is: “What does Primary key refer to?”
The accepted answer is A. A column or set of columns that uniquely identifies each row in a database table.. A column or set of columns that uniquely identifies each row in a database table is the fact required by What does Primary key refer to option A Option B The process of intentionally introducing redundancy into a database to improve read performance does not match the stem it is a near-miss used to catch incomplete recall of A column or set of columns that uniquely identifies each row in a database table Option C A situation in which two transactions are each waiting for the other to release a lock preventing progress does not match the stem it is a near-miss used to catch incomplete recall of A column or set of columns that uniquely identifies each row in.
- 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.
Why not B: “The process of intentionally introducing redundancy into a database to improve read performance.” is not correct. The accepted answer is A. A column or set of columns that uniquely identifies each row in a database table.. A column or set of columns that uniquely identifies each row in a database table is the fact required by What does Primary key refer to option A Option B The process of intentional
- C. A situation in which two transactions are each waiting for the other to release a lock, preventing progress.
Why not C: “A situation in which two transactions are each waiting for the other to release a lock, preventing progress.” is not correct. The accepted answer is A. A column or set of columns that uniquely identifies each row in a database table.. A column or set of columns that uniquely identifies each row in a database table is the fact required by What does Primary key refer to option A Option B The process of intentional
- D. The process of organizing database tables to reduce data redundancy and improve data integrity.
Why not D: “The process of organizing database tables to reduce data redundancy and improve data integrity.” is not correct. The accepted answer is A. A column or set of columns that uniquely identifies each row in a database table.. A column or set of columns that uniquely identifies each row in a database table is the fact required by What does Primary key refer to option A Option B The process of intentional
Correct answer
A. A column or set of columns that uniquely identifies each row in a database table.
Explanation
A column or set of columns that uniquely identifies each row in a database table is the fact required by What does Primary key refer to option A Option B The process of intentionally introducing redundancy into a database to improve read performance does not match the stem it is a near-miss used to catch incomplete recall of A column or set of columns that uniquely identifies each row in a database table Option C A situation in which two transactions are each waiting for the other to release a lock preventing progress does not match the stem it is a near-miss used to catch incomplete recall of A column or set of columns that uniquely identifies each row in.
Source: Database Management Systems (DBMS) Official Reference Guide
Tags: computer science, dbms, SQL, databases
Submitted by: MCQsHub Editorial
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