Which of the following is a purpose of a database management system? MCQ with Answer and Explanation

Which of the following is a purpose of a database management system?
A. To manipulate data
B. All of the above
C. To define and create databases
D. To control access to data
Answer: Option B
Solution (By JKSSB Mock Tests)
A DBMS provides functionalities for defining, constructing, manipulating, and controlling access to databases.

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Practice More Database Management System (DBMS) Questions

Question #1
Which type of JOIN returns all matching rows from both tables, plus all unmatched rows from the left table with NULL values filled in for the right table columns?
A. Inner Join
B. Full Outer Join
C. Right Outer Join
D. Left Outer Join

Correct Answer: Option D


Explanation:
A Left Outer Join preserves all records from the left table, matching them with right table records when possible, or inserting NULL values if no match is found.

This question belongs to: Computer Database Management System (DBMS)
Question #2
Which SQL wildcard character is used to match exactly one single character when using the LIKE operator?
A. Underscore (*)
B. Asterisk (*)
C. Percentage sign (%)
D. Question mark (?)

Correct Answer: Option A


Explanation:
In SQL pattern matching with the LIKE operator, the underscore (*) represents exactly one single character, while the percent sign (%) matches zero or more characters.

This question belongs to: Computer Database Management System (DBMS)
Question #3
Which type of join returns all rows from the left table and matching rows from the right table?
A. INNER JOIN
B. FULL JOIN
C. LEFT JOIN
D. RIGHT JOIN

Correct Answer: Option C


Explanation:
LEFT JOIN (or LEFT OUTER JOIN) returns all rows from the left table, with matching rows from the right table; NULLs appear when no match.

This question belongs to: Computer Database Management System (DBMS)