Given the following tables: Which of the following will be the dimensions from a FULL JOIN of the tables above?

The correct answer is D. Four rows and four columns. A FULL JOIN (also called a FULL OUTER JOIN) returns all rows from both the left and right tables, matching rows where join keys align and filling NULL values where there is no match. This means the result set includes every row from both tables, preserving unmatched rows from…

Data Concepts and Environments

Question

Given the following tables:

Which of the following will be the dimensions from a FULL JOIN of the tables above?

Exhibit

Options

ATwo rows and three columns
BThree rows and four columns
CFour rows and two columns
DFour rows and four columns

How the community answered

(21 responses)

A
5% (1)
B
10% (2)
D
86% (18)

Explanation

A FULL JOIN (also called a FULL OUTER JOIN) returns all rows from both the left and right tables, matching rows where join keys align and filling NULL values where there is no match. This means the result set includes every row from both tables, preserving unmatched rows from each side. Based on the tables provided in the question, the FULL JOIN produces four rows (all rows from both tables combined, with NULLs where there is no match) and four columns (all columns from both tables combined). This is distinct from an INNER JOIN (only matching rows), LEFT JOIN (all left rows), or RIGHT JOIN (all right rows).

Topics

#SQL JOIN#Relational Databases#Database Operations

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