Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following is a DML command?
A. SELECT
B. CREATE
C. ALTER
D. DROP
Answer: SELECT
What is the main function of ‘DML’ (Data Manipulation Language)?
A. To retrieve and manipulate data within a database
B. To define the structure of a database
C. To delete the database
D. To back up the database
Answer: To retrieve and manipulate data within a database
What is a ‘candidate key’ in DBMS?
A. A key that can uniquely identify any record in a table
B. A foreign key used in joins
C. A key used for data encryption
D. A composite key in a database
Answer: A key that can uniquely identify any record in a table
Which of the following is a type of database index?
A. B-tree index
B. F-tree index
C. P-tree index
D. Z-tree index
Answer: B-tree index
Which of the following is not a characteristic of a ‘transaction’ in DBMS?
A. It is atomic
B. It can be partial
C. It is consistent
D. It is isolated
Answer: It can be partial
What is the main function of ‘DDL’ (Data Definition Language)?
A. To define and modify the structure of database objects
B. To retrieve data from the database
C. To backup the database
D. To update records in a table
Answer: To define and modify the structure of database objects
Which of the following is a DDL command?
A. CREATE
B. INSERT
C. UPDATE
D. DELETE
Answer: CREATE
What is the ‘ER model’ in databases?
A. Entity-Relationship model, used to visually describe data and its relationships
B. Encryption-Record model for securing data
C. Evaluation-Report model for analyzing database performance
D. Error-Response model for handling database errors
Answer: Entity-Relationship model, used to visually describe data and its relationships
What is the role of ‘data integrity’ in databases?
A. To ensure accuracy and consistency of data
B. To encrypt sensitive data
C. To create backup data
D. To control user access to data
Answer: To ensure accuracy and consistency of data