What is the meaning of the term 'redundancy' in databases? MCQ with Answer and Explanation

Question
What is the meaning of the term 'redundancy' in databases?
A. Data in multiple tables
B. Lack of data
C. Inconsistent data
D. Duplicate storage of the same data
Answer: Option D
Solution (By JKSSB Mock Tests)
Redundancy refers to the unnecessary duplication of data, which can lead to anomalies and wasted storage.
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
What is the purpose of the SQL GROUP BY ... HAVING combination?
A. To filter groups based on aggregate values
B. To join groups
C. To sort groups
D. To select individual rows
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Correct Answer: Option A

Explanation:
HAVING is used in conjunction with GROUP BY to filter groups based on conditions applied to aggregate functions.
This question belongs to: Computer Database Management System (DBMS)
Question #2
Which SQL command is used to permanently remove an entire table structure along with all its data from the database?
A. DELETE
B. TRUNCATE
C. DROP
D. REMOVE
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Correct Answer: Option C

Explanation:
The DROP command is a DDL statement that completely removes a table's structure, definition, and all its associated data from the database.
This question belongs to: Computer Database Management System (DBMS)
Question #3
Which of the following is a valid SQL datatype for storing variable-length strings?
A. DATE
B. CHAR
C. VARCHAR
D. INT
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Correct Answer: Option C

Explanation:
VARCHAR stores variable-length character strings. CHAR stores fixed-length strings.
This question belongs to: Computer Database Management System (DBMS)
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