Solution:Step 1: Understand the JOIN conditionThe JOIN matches students.id with grades.student_id, linking each student to their scores.Step 2: Predict the output columnsThe SELECT returns student names and their scores from matching rows only.Final Answer:A list of student names with their correspo

[Solved] Given two tables:students(id, name)grades(student_id, score)What will be the result of this query?SELECT students.name, grades.score FROM students JOIN grades ON students.id = grades.student_id; | PostgreSQL

PostgreSQL - Joins in PostgreSQL

Given two tables:
students(id, name)
grades(student_id, score)
What will be the result of this query?

SELECT students.name, grades.score FROM students JOIN grades ON students.id = grades.student_id;

AA list of scores without student names.

BA list of student names with their corresponding scores.

CAn error because JOIN syntax is wrong.

DA list of all students with NULL scores.

Step-by-Step Solution

Solution:

Step 1: Understand the JOIN condition
The JOIN matches students.id with grades.student_id, linking each student to their scores.
Step 2: Predict the output columns
The SELECT returns student names and their scores from matching rows only.
Final Answer:
A list of student names with their corresponding scores. -> Option B
Quick Check:
JOIN matches students to scores = D [OK]

Quick Trick: JOIN returns matched rows combining columns [OK]

Common Mistakes:

Assuming all students appear even without scores
Thinking JOIN causes syntax error here
Expecting only scores without names

Master "Joins in PostgreSQL" in PostgreSQL

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Learn Why Deep Visual Try Challenge Project Recall Time

Given two tables:

Step 1: Understand the JOIN condition

Step 2: Predict the output columns

Final Answer:

Quick Check:

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