Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What is a ‘data model’ in DBMS?
A. An abstract representation of the structure of a database
B. A backup method for databases
C. A query language for databases
D. A type of index for records
Answer: An abstract representation of the structure of a database
What is a ‘non-relational’ database?
A. A database that stores data in a non-tabular form
B. A database that cannot be queried
C. A database that does not support primary keys
D. A database that stores only flat files
Answer: A database that stores data in a non-tabular form
What is a ‘composite key’ in a database?
A. A key that consists of two or more columns
B. A unique key
C. A key used for indexing
D. A key that encrypts data
Answer: A key that consists of two or more columns
What does the ‘SELECT’ statement do in SQL?
A. Retrieves data from a database
B. Deletes data from a table
C. Updates records
D. Creates a new table
Answer: Retrieves data from a database
What is a database?
A. A collection of organized data that allows access, retrieval, and use of that data
B. A type of software used for web development
C. A system that encrypts files
D. A method to compress data
Answer: A collection of organized data that allows access, retrieval, and use of that data
What is a ‘schema’ in a database?
A. A blueprint or architecture of a database
B. A method to encrypt data
C. A form of database query
D. A type of index in a table
Answer: A blueprint or architecture of a database
Which SQL function returns the number of rows in a result set?
A. COUNT()
B. SUM()
C. AVG()
D. MAX()
Answer: COUNT()
What is the function of a ‘cursor’ in SQL?
A. To retrieve rows one at a time in a result set
B. To execute SQL queries
C. To delete rows from a table
D. To modify table structures
Answer: To retrieve rows one at a time in a result set
Which type of JOIN returns all records from the left table and the matched records from the right table?
A. LEFT JOIN
B. RIGHT JOIN
C. INNER JOIN
D. FULL JOIN
Answer: LEFT JOIN