Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What is a ‘trigger’ in a database?
A. A set of actions that is automatically executed when an event occurs
B. A column that has unique values
C. A query that retrieves data from a table
D. A key used for indexing
Answer: A set of actions that is automatically executed when an event occurs
What is the use of the ‘UNIQUE’ constraint in a table?
A. Ensures all values in a column are distinct
B. Ensures all values in a column are the same
C. Adds duplicate values in a table
D. Deletes duplicate records from a table
Answer: Ensures all values in a column are distinct
Which of the following is NOT a SQL aggregate function?
A. JOIN
B. COUNT
C. SUM
D. AVG
Answer: JOIN
Which SQL function is used to return the maximum value of a column?
A. MAX()
B. GREATEST()
C. MAXIMUM()
D. TOP()
Answer: MAX()
Which of the following is a feature of a relational database?
A. Data is organized into tables
B. Data is stored as flat files
C. Data is stored in a hierarchical structure
D. Data is stored in unstructured documents
Answer: Data is organized into tables
Which command is used to remove all rows from a table but not the table structure?
A. TRUNCATE
B. DROP
C. DELETE
D. ALTER
Answer: TRUNCATE
What is a ‘foreign key’ in a relational database?
A. A key used to link two tables together
B. A unique identifier for each record
C. A key that contains composite data
D. A key that refers to data within the same table
Answer: A key used to link two tables together
What does ‘JOIN’ do in SQL?
A. Combines rows from two or more tables based on a related column
B. Deletes all rows from a table
C. Creates a new table
D. Indexes data from a table
Answer: Combines rows from two or more tables based on a related column
What is the main advantage of indexing in a database?
A. Increases query performance
B. Increases data storage size
C. Slows down data retrieval
D. Removes duplicate data
Answer: Increases query performance