Rows where both id and class match in both tables.

Rows where only class matches in both tables.

Rows where only id matches in both tables.

Solution:Step 1: Identify common columnsBoth tables share columns id and class.Step 2: Understand NATURAL JOIN behaviorNATURAL JOIN matches on all columns with the same names, so it joins on both id and class.Final Answer:Rows where both id and class match in both tables. -> Option BQuick Check:NATU

[Solved] Given two tables:students(id, name, class)enrollments(id, class, grade)What will be the result of this query?SELECT * FROM students NATURAL JOIN enrollments; | PostgreSQL

PostgreSQL - Joins in PostgreSQL

Given two tables:
students(id, name, class)
enrollments(id, class, grade)
What will be the result of this query?

SELECT * FROM students NATURAL JOIN enrollments;

AAll rows from students combined with all rows from enrollments.

BRows where both <code>id</code> and <code>class</code> match in both tables.

CRows where only <code>class</code> matches in both tables.

DRows where only <code>id</code> matches in both tables.

Step-by-Step Solution

Solution:

Step 1: Identify common columns
Both tables share columns id and class.
Step 2: Understand NATURAL JOIN behavior
NATURAL JOIN matches on all columns with the same names, so it joins on both id and class.
Final Answer:
Rows where both id and class match in both tables. -> Option B
Quick Check:
NATURAL JOIN matches all common columns [OK]

Quick Trick: NATURAL JOIN uses all same-named columns to join [OK]

Common Mistakes:

Assuming join on only one common column
Confusing NATURAL JOIN with JOIN USING
Expecting Cartesian product instead of filtered rows

Master "Joins in PostgreSQL" in PostgreSQL

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Given two tables:

Step 1: Identify common columns

Step 2: Understand NATURAL JOIN behavior

Final Answer:

Quick Check:

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