Which type of join returns all rows from the left table and matching rows from the right table? MCQ with Answer and Explanation

Question
Which type of join returns all rows from the left table and matching rows from the right table?
A. INNER JOIN
B. RIGHT JOIN
C. FULL JOIN
D. LEFT JOIN
Answer: Option D
Solution (By JKExamLibrary)
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)
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Question #1
Information is:
A. Raw facts and figures
B. Processed and meaningful form of data
C. Hardware component
D. Programming code
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Correct Answer: Option B

Explanation:
Information is data that has been organized and processed to provide context and meaning.
This question belongs to: Computer Database Management System (DBMS)
Question #2
Which constraint ensures that a column cannot accept or store an unassigned or missing value?
A. UNIQUE
B. DEFAULT
C. NOT NULL
D. CHECK
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Correct Answer: Option C

Explanation:
The NOT NULL constraint explicitly forces a column to always contain a value, preventing blank or NULL entries.
This question belongs to: Computer Database Management System (DBMS)
Question #3
RDBMS is based on which model?
A. Relational model
B. Hierarchical model
C. Object-oriented model
D. Network model
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Correct Answer: Option A

Explanation:
Relational Database Management System (RDBMS) is based on the relational model proposed by E.F. Codd.
This question belongs to: Computer Database Management System (DBMS)
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