What is the purpose of the SQL 'NULL' value? MCQ with Answer and Explanation
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Question #1
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What is a data dictionary in a DBMS?
Correct Answer: Option D
Explanation:
The data dictionary stores metadata such as table definitions, column types, constraints, and other database objects.
The data dictionary stores metadata such as table definitions, column types, constraints, and other database objects.
This question belongs to:
Computer
Database Management System (DBMS)
Question #2
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Which of the following is a property of a well-designed database?
Correct Answer: Option D
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 #3
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Which SQL component is used to specify a fallback default value for a column when no value is provided during an insert operation?
Correct Answer: Option D
Explanation:
The DEFAULT constraint assigns a predefined default value to a column when an INSERT statement does not explicitly provide a value for that column.
The DEFAULT constraint assigns a predefined default value to a column when an INSERT statement does not explicitly provide a value for that column.
This question belongs to:
Computer
Database Management System (DBMS)
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