What is a subquery in SQL? MCQ with Answer and Explanation

Question
What is a subquery in SQL?
A. A query that returns multiple results
B. A query that is always correlated
C. A query nested inside another query
D. A query that is used to create a table
Answer: Option C
Solution (By JKSSB Mock Tests)
A subquery is a SELECT statement nested within another SQL statement (e.g., SELECT, INSERT, UPDATE, DELETE).
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
Data that has been processed, organized, structured, or presented in a given context to make it useful is known as what?
A. Information
B. Field
C. Raw facts
D. Database
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Correct Answer: Option A

Explanation:
Information is data that has been processed, structured, or organized in a meaningful way to provide context and utility to the user.
This question belongs to: Computer Database Management System (DBMS)
Question #2
Which of the following is a valid SQL data type for a date and time?
A. DATE
B. DATETIME
C. TIMESTAMP
D. All of the above
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Correct Answer: Option D

Explanation:
Different DBMS support DATETIME, TIMESTAMP, DATE, etc. All are valid date/time types.
This question belongs to: Computer Database Management System (DBMS)
Question #3
In an Entity-Relationship (ER) diagram, attributes are represented using which shape?
A. Square
B. Ellipse/Oval
C. Rectangle
D. Diamond
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Correct Answer: Option B

Explanation:
Ellipses or ovals are used to represent attributes (properties) of entities in ER diagrams.
This question belongs to: Computer Database Management System (DBMS)
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