Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What does the ‘IS NULL’ condition check for in SQL?
A. Records that have no value in the specified column
B. Records with duplicate values
C. Records that match a given condition
D. Records that have zero values
Answer: Records that have no value in the specified column
Which statement is true about the ‘UNION’ operator in SQL?
A. It combines the result sets of two or more SELECT statements without duplicates
B. It creates a new table from the combined result sets
C. It allows duplicate rows in the result
D. It is used to group data based on a condition
Answer: It combines the result sets of two or more SELECT statements without duplicates
What is the purpose of a ‘check constraint’ in a database?
A. To enforce a rule on data in a column
B. To prevent duplicate entries
C. To define relationships between tables
D. To create an index for faster querying
Answer: To enforce a rule on data in a column
Which of the following is a valid SQL command to delete a column from a table?
A. ALTER TABLE DROP COLUMN
B. DELETE COLUMN FROM TABLE
C. REMOVE COLUMN
D. MODIFY TABLE DELETE COLUMN
Answer: ALTER TABLE DROP COLUMN
Which of the following SQL commands is used to create a new table?
A. CREATE TABLE
B. ADD TABLE
C. MAKE TABLE
D. NEW TABLE
Answer: CREATE TABLE
What does ‘DML’ stand for in SQL?
A. Data Manipulation Language
B. Data Migration Language
C. Data Modeling Language
D. Data Monitoring Language
Answer: Data Manipulation Language
Which of the following is an example of a NoSQL database?
A. MongoDB
B. PostgreSQL
C. SQLite
D. MySQL
Answer: MongoDB
In a database, which type of key is used to maintain referential integrity?
A. Foreign key
B. Primary key
C. Candidate key
D. Composite key
Answer: Foreign key
What is the main difference between ‘TRUNCATE’ and ‘DELETE’ in SQL?
A. TRUNCATE removes all rows without logging individual row deletions
B. DELETE removes all rows permanently
C. DELETE does not remove rows from the table
D. TRUNCATE can be used with a WHERE clause
Answer: TRUNCATE removes all rows without logging individual row deletions