Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What is a ‘primary key’ used for in a relational database?
A. To uniquely identify each record in a table
B. To reference a record in another table
C. To sort records in a table
D. To create a relationship between two tables
Answer: To uniquely identify each record in a table
In a database, what is a ‘transaction’?
A. A sequence of one or more SQL operations executed as a single unit
B. A method to create indexes
C. A command to retrieve data from multiple tables
D. A method to optimize database storage
Answer: A sequence of one or more SQL operations executed as a single unit
Which SQL keyword is used to retrieve data from a database?
A. SELECT
B. GET
C. RETRIEVE
D. FETCH
Answer: SELECT
Which of the following is a relational database management system?
A. MySQL
B. MongoDB
C. Redis
D. Cassandra
Answer: MySQL
In SQL, which clause is used to filter the result set based on a condition?
A. WHERE
B. GROUP BY
C. ORDER BY
D. LIMIT
Answer: WHERE
Which SQL function returns the number of records in a result set?
A. COUNT()
B. SUM()
C. MAX()
D. MIN()
Answer: COUNT()
Which of the following statements best describes a ‘foreign key’?
A. A key used to link two tables together
B. A key that uniquely identifies each record
C. A key that can have duplicate values
D. A key used for indexing data
Answer: A key used to link two tables together
What does the ‘SELECT’ statement in SQL do?
A. Retrieves data from a database
B. Deletes data from a database
C. Inserts data into a database
D. Updates data in a database
Answer: Retrieves data from a database
Which of the following best defines a ‘view’ in SQL?
A. A virtual table based on the result of a SELECT query
B. A table that stores duplicate data
C. A function used for sorting data
D. A special type of index
Answer: A virtual table based on the result of a SELECT query