Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following commands is used to remove a table from a database?
A. DROP
B. DELETE
C. TRUNCATE
D. REMOVE
Answer: DROP
Which SQL keyword is used to retrieve unique values from a column?
A. DISTINCT
B. UNIQUE
C. FILTER
D. SEPARATE
Answer: DISTINCT
What is the purpose of the ‘WHERE’ clause in SQL?
A. To filter records that meet a specified condition
B. To sort the result set
C. To group data
D. To combine records from multiple tables
Answer: To filter records that meet a specified condition
Which of the following is NOT a type of join in SQL?
A. OUTER JOIN
B. INNER JOIN
C. CROSS JOIN
D. FULL JOIN
Answer: FULL JOIN
What does ‘DDL’ stand for in database management?
A. Data Definition Language
B. Data Deletion Language
C. Data Description Language
D. Data Distribution Language
Answer: Data Definition Language
Which of the following is used to uniquely identify a record in a database table?
A. Primary key
B. Foreign key
C. Index
D. View
Answer: Primary key
What is the function of the ‘INSERT’ statement in SQL?
A. To add new rows to a table
B. To modify existing rows in a table
C. To delete rows from a table
D. To remove a column from a table
Answer: To add new rows to a table
Which of the following best describes a ‘composite primary key’?
A. A primary key made up of two or more columns
B. A key that can take NULL values
C. A key used for indexing
D. A foreign key in another table
Answer: A primary key made up of two or more columns
What is ‘data mining’?
A. The process of discovering patterns in large datasets
B. The process of backing up data
C. The process of deleting redundant data
D. The process of indexing a table
Answer: The process of discovering patterns in large datasets