MySQL Subquery Exercises: List the department ID and name of all the departments where no employee is working

MySQL Subquery: Exercise-19 with Solution

Write a query to list the department ID and name of all the departments where no employee is working.

Sample table: employees

Sample table : departments

Code:

SELECT * FROM departments 
WHERE department_id 
NOT IN (select department_id FROM employees);

Explanation:

MySQL Subquery Syntax :

- The subquery (inner query) executes once before the main query (outer query) executes.
- The main query (outer query) use the subquery result.

MySQL Code Editor:

Structure of 'hr' database:

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