In SQL, what does the 'IS NULL' operator check? MCQ with Answer and Explanation
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Question #1
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What is the purpose of the SQL 'DEFAULT' constraint?
Correct Answer: Option C
Explanation:
DEFAULT assigns a default value to a column if an INSERT statement does not specify a value.
DEFAULT assigns a default value to a column if an INSERT statement does not specify a value.
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Computer
Database Management System (DBMS)
Question #2
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Which normal form is stricter than 3NF and is often described as a configuration where every determinant must be a candidate key?
Correct Answer: Option D
Explanation:
Boyce-Codd Normal Form (BCNF) is a stronger version of 3NF. A relation is in BCNF if, for every non-trivial functional dependency X -> Y, X is a candidate key.
Boyce-Codd Normal Form (BCNF) is a stronger version of 3NF. A relation is in BCNF if, for every non-trivial functional dependency X -> Y, X is a candidate key.
This question belongs to:
Computer
Database Management System (DBMS)
Question #3
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In SQL, what is the purpose of the LIKE operator?
Correct Answer: Option D
Explanation:
LIKE is used with wildcards (% and _) to search for a specified pattern in a column.
LIKE is used with wildcards (% and _) to search for a specified pattern in a column.
This question belongs to:
Computer
Database Management System (DBMS)
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