Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What does the ‘ALTER’ command do in SQL?
A. Modifies the structure of a table
B. Retrieves data from a table
C. Inserts new records
D. Deletes records
Answer: Modifies the structure of a table
What is the ‘TRUNCATE’ command used for?
A. To remove all rows from a table without logging individual row deletions
B. To delete a table
C. To update records in a table
D. To create a new table
Answer: To remove all rows from a table without logging individual row deletions
What is a ‘unique key’ in a database?
A. A key that ensures all values in a column are unique
B. A key that references other tables
C. A key that allows duplicate values
D. A key used to encrypt data
Answer: A key that ensures all values in a column are unique
What is an index in a database?
A. A database object that speeds up data retrieval
B. A field used for encryption
C. A command to create tables
D. A way to insert data
Answer: A database object that speeds up data retrieval
What is the purpose of the ‘HAVING’ clause in SQL?
A. To filter groups based on conditions
B. To create new columns
C. To modify existing data
D. To delete records
Answer: To filter groups based on conditions
What is a ‘JOIN’ in SQL?
A. A method to combine records from two or more tables based on a related column
B. A way to delete multiple tables at once
C. A method to create tables
D. A way to insert data into multiple tables
Answer: A method to combine records from two or more tables based on a related column
What does the ‘GROUP BY’ clause do in SQL?
A. Groups rows that have the same values into summary rows
B. Sorts the data in descending order
C. Combines two tables
D. Filters data based on a condition
Answer: Groups rows that have the same values into summary rows
Which SQL clause is used to filter records?
A. WHERE
B. SELECT
C. FROM
D. ORDER BY
Answer: WHERE
What is a ‘view’ in SQL?
A. A virtual table that is based on the result of an SQL query
B. A command to view all records in a table
C. A physical copy of a table
D. A temporary table that exists only for one session
Answer: A virtual table that is based on the result of an SQL query