Database Management Systems (DBMS)
Which term refers to a column or set of columns that uniquely identifies each row in a database table?
Difficulty: Easy
About this MCQ
This Easy Database Management Systems (DBMS) question asks: Which term refers to a column or set of columns that uniquely identifies each row in a database table? The correct choice is C. Primary key. 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. Denormalization
Why not A: “Denormalization” does not fit this question. The answer is Primary key.
- B. Database trigger
Why not B: “Database trigger” does not fit this question. The answer is Primary key.
- C. Primary key ✓
- D. Transaction deadlock
Why not D: “Transaction deadlock” does not fit this question. The answer is Primary key.
Correct answer
C. Primary key
Explanation
Primary key is the term that matches “Which term refers to a column or set of columns that uniquely identifies each row in a database table” (option C). Option A (Denormalization) does not fit this question. Option B (Database trigger) does not fit this question. Option D (Transaction deadlock) does not fit this question. For this Database Management Systems (DBMS) question, the accepted answer is Primary key.
Source: Database Management Systems (DBMS) Official Reference Guide
Tags: computer science, dbms, SQL, databases
Submitted by: MCQsHub Editorial
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