Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following is a relational database management system (RDBMS)?
A. MySQL
B. MongoDB
C. Cassandra
D. Redis
Answer: MySQL
What is a ‘subquery’ in SQL?
A. A query within another query
B. A type of index
C. A method to join tables
D. A function to retrieve data
Answer: A query within another query
What is the purpose of a ‘stored procedure’ in a database?
A. To execute a set of SQL statements as a single unit
B. To store tables in memory
C. To create indexes on tables
D. To replicate data across databases
Answer: To execute a set of SQL statements as a single unit
Which of the following SQL clauses is used to sort the result set?
A. ORDER BY
B. SORT BY
C. GROUP BY
D. FILTER BY
Answer: ORDER BY
What is the purpose of ‘data replication’ in database systems?
A. To create multiple copies of data for reliability and availability
B. To encrypt all sensitive data
C. To reduce the size of the database
D. To improve query performance
Answer: To create multiple copies of data for reliability and availability
Which of the following is an advantage of using a view in a database?
A. It provides a simplified interface for querying complex data
B. It encrypts all data in the table
C. It reduces the size of the database
D. It increases the redundancy of data
Answer: It provides a simplified interface for querying complex data
Which of the following is a feature of NoSQL databases?
A. Flexible schema
B. Fixed schema
C. Data is always relational
D. Data is stored as tables
Answer: Flexible schema
What is ‘SQL injection’?
A. A security vulnerability that allows attackers to manipulate SQL queries
B. A method to enhance SQL query performance
C. A type of SQL function
D. A database recovery process
Answer: A security vulnerability that allows attackers to manipulate SQL queries
Which of the following best defines ‘data redundancy’?
A. Storing the same data in multiple places
B. Encrypting data multiple times
C. Storing backup copies of data
D. Compressing data to reduce storage
Answer: Storing the same data in multiple places