Solution:Step 1: Understand INNER JOIN behaviorINNER JOIN returns rows where the join condition matches in both tables.Step 2: Analyze the query conditionIt joins employees and departments where employees.id equals departments.id, returning matching pairs.Final Answer:All employees with their matchi

[Solved] Given tables:employees(id, name)departments(id, dept_name)What will this query return?SELECT employees.name, departments.dept_name FROM employees INNER JOIN departments ON employees.id = departments.... | PostgreSQL

PostgreSQL - Joins in PostgreSQL

Given tables:
employees(id, name)
departments(id, dept_name)
What will this query return?

SELECT employees.name, departments.dept_name FROM employees INNER JOIN departments ON employees.id = departments.id;

ASyntax error due to wrong JOIN condition

BAll employees with all department names regardless of id

CAll employees with their matching department names where ids match

DOnly employees without departments

Step-by-Step Solution

Solution:

Step 1: Understand INNER JOIN behavior
INNER JOIN returns rows where the join condition matches in both tables.
Step 2: Analyze the query condition
It joins employees and departments where employees.id equals departments.id, returning matching pairs.
Final Answer:
All employees with their matching department names where ids match -> Option C
Quick Check:
INNER JOIN = matching rows only [OK]

Quick Trick: INNER JOIN returns only matching rows from both tables [OK]

Common Mistakes:

Thinking INNER JOIN returns all rows from both tables
Assuming it returns unmatched rows
Believing the query has syntax errors

Master "Joins in PostgreSQL" in PostgreSQL

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Learn Why Deep Visual Try Challenge Project Recall Time

Given tables:

Step 1: Understand INNER JOIN behavior

Step 2: Analyze the query condition

Final Answer:

Quick Check:

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