[Solved] You want to list all employees and their department names, but some employees have no... Which join type should you use to ensure all employees appear, even if their department is missing? | SQL

SQL - INNER JOIN

You want to list all employees and their department names, but some employees have no department assigned. Which join type should you use to ensure all employees appear, even if their department is missing?

ARIGHT JOIN

BINNER JOIN

CLEFT JOIN

DFULL JOIN

Step-by-Step Solution

Solution:

Step 1: Understand join types and their row inclusion
INNER JOIN includes only matching rows; LEFT JOIN includes all rows from the left table and matches from right; RIGHT JOIN is opposite; FULL JOIN includes all rows from both.
Step 2: Apply to employees and departments
To list all employees even if no department exists, use LEFT JOIN from Employees (left) to Departments (right).
Final Answer:
LEFT JOIN -> Option C
Quick Check:
LEFT JOIN keeps all left table rows [OK]

Quick Trick: Use LEFT JOIN to keep all left table rows [OK]

Common Mistakes:

MISTAKES

Using INNER JOIN and missing employees without departments
Confusing RIGHT JOIN with LEFT JOIN
Assuming FULL JOIN is needed when LEFT JOIN suffices

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Which join type should you use to ensure all employees appear, even if their department is missing?

Step 1: Understand join types and their row inclusion

Step 2: Apply to employees and departments

Final Answer:

Quick Check:

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