Database Management Systems (DBMS)
What does Primary key refer to?
Difficulty: Easy
About this MCQ
This Easy Database Management Systems (DBMS) question asks: What does Primary key refer to? The correct choice is A. A column or set of columns that uniquely identifies each row in a database table.. Read the options below, commit to one, then use the explanation to see why that choice holds and why the others do not.
Database Management Systems (DBMS) items like this one are written for Pakistan exams such as CSS, FPSC, PPSC, and NTS. The difficulty label is a hint about how much of the topic the stem assumes, not a score. Tags and exam names, when they are present, tell you where else the same idea is tested. Previous and next links stay in Database Management Systems (DBMS) so you can continue the subject. Related questions point at nearby stems if you want another angle on the same idea.
Treat the explanation as part of the question, not a footnote. If you missed it, reread the stem against the correct option before you open the next Database Management Systems (DBMS) item. A timed quiz is the same pool with a clock and a score. A past paper is a full sitting rather than this single question.
- 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.” does not fit this question. The answer is A column or set of columns that uniquely identifies each row in a database table..
- 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.” does not fit this question. The answer is A column or set of columns that uniquely identifies each row in a database table..
- 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.” does not fit this question. The answer is A column or set of columns that uniquely identifies each row in a database table..
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 option A is the accepted answer to What does Primary key refer to Option B The process of intentionally introducing redundancy into a database to improve read performance does not fit this question Option C A situation in which two transactions are each waiting for the other to release a lock preventing progress does not fit this question Option D The process of organizing database tables to reduce data redundancy and improve data integrity does not fit this question For this Database Management Systems DBMS question the accepted answer is A column or set of.
Source: Database Management Systems (DBMS) Official Reference Guide
Tags: computer science, dbms, SQL, databases
Submitted by: MCQsHub Editorial
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