Which constraint ensures that all values in a column are unique? MCQ with Answer and Explanation
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Practice More Database Management System (DBMS) Questions
Question #1
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Which of the following is an example of DML command?
Correct Answer: Option D
Explanation:
INSERT is a Data Manipulation Language (DML) command used to add data to tables.
INSERT is a Data Manipulation Language (DML) command used to add data to tables.
This question belongs to:
Computer
Database Management System (DBMS)
Question #2
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In SQL, the WHERE clause is used in:
Correct Answer: Option B
Explanation:
WHERE clause filters records in SELECT, UPDATE, and DELETE operations.
WHERE clause filters records in SELECT, UPDATE, and DELETE operations.
This question belongs to:
Computer
Database Management System (DBMS)
Question #3
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The concept that prevents concurrent transactions from interfering with each other and creating data inconsistencies is known as what?
Correct Answer: Option B
Explanation:
Isolation ensures that the execution of concurrent transactions does not interfere with one another, making them appear as if they are executing sequentially.
Isolation ensures that the execution of concurrent transactions does not interfere with one another, making them appear as if they are executing sequentially.
This question belongs to:
Computer
Database Management System (DBMS)
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