Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What is ‘normalization’ in database design?
A. The process of organizing data to reduce redundancy
B. A way to increase data redundancy
C. A method to encrypt data
D. A tool for data mining
Answer: The process of organizing data to reduce redundancy
Which of the following is a valid SQL data type?
A. VARCHAR
B. STRING
C. TEXTARRAY
D. INTARRAY
Answer: VARCHAR
Which SQL statement is used to update data in a database?
A. UPDATE
B. ALTER
C. CHANGE
D. MODIFY
Answer: UPDATE
Which of the following best describes a primary key in a relational database?
A. A unique identifier for each record in a table
B. A key that allows duplicate values
C. A key used to refer to data in other tables
D. A key that contains multiple columns
Answer: A unique identifier for each record in a table
What does ‘ACID’ stand for in database transactions?
A. Atomicity, Consistency, Isolation, Durability
B. Accuracy, Complexity, Isolation, Dependency
C. Automation, Consistency, Integrity, Durability
D. Atomicity, Clarity, Isolation, Dependency
Answer: Atomicity, Consistency, Isolation, Durability
Which of the following is a NoSQL database?
A. MongoDB
B. MySQL
C. PostgreSQL
D. Oracle
Answer: MongoDB
What is the ‘cursor’ in database management?
A. A database object used to retrieve rows from a result set one at a time
B. A tool used for encryption
C. A graphical interface to edit databases
D. A pointer to an index in the database
Answer: A database object used to retrieve rows from a result set one at a time
What is the purpose of ‘ETL’ in database management?
A. Extract, Transform, Load – A process used to collect data from various sources
B. Encrypt, Transfer, Log – A process to secure data
C. Execute, Test, Load – A process for testing databases
D. Edit, Transform, List – A process to modify database tables
Answer: Extract, Transform, Load – A process used to collect data from various sources
Which SQL keyword is used to combine the result sets of two or more SELECT statements?
A. UNION
B. JOIN
C. MERGE
D. GROUP BY
Answer: UNION