Which of the following is not an aggregate function in SQL? MCQ with Answer and Explanation
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Question #1
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Which of the following is a property of a well-designed database?
Correct Answer: Option A
Explanation:
Good database design aims to minimize redundancy, simplify maintenance, and provide efficient access.
Good database design aims to minimize redundancy, simplify maintenance, and provide efficient access.
This question belongs to:
Computer
Database Management System (DBMS)
Question #2
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What is a self join?
Correct Answer: Option A
Explanation:
A self join is a join where a table is joined with itself, often used to compare rows within the same table.
A self join is a join where a table is joined with itself, often used to compare rows within the same table.
This question belongs to:
Computer
Database Management System (DBMS)
Question #3
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Which database anomaly describes the necessity to update the exact same data value in multiple independent rows, creating a risk of data inconsistency?
Correct Answer: Option A
Explanation:
An Update Anomaly occurs when data is redundantly duplicated across rows, requiring changes to be made to every copy, risking inconsistencies if any row is missed.
An Update Anomaly occurs when data is redundantly duplicated across rows, requiring changes to be made to every copy, risking inconsistencies if any row is missed.
This question belongs to:
Computer
Database Management System (DBMS)
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