SQL Exercise: List the employee who are not working under a manager

Last update on December 20 2024 11:40:13 (UTC/GMT +8 hours)

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26. From the following table, write a SQL query identify the employees who do not report to a manager. Return employee name, job name.

Sample table: employees

Pictorial Presentation:

Sample Solution:

SELECT e.emp_name,
       e.job_name
FROM employees e
WHERE manager_id IS NULL;

Sample Output:

 emp_name     | job_name
--------------+--------------
  KAYLING     | PRESIDENT

Explanation:

The said query in SQL that retrieves a list of all employees who do not have a manager, along with their name and job position from the 'employees' table.

The WHERE clause that filters the results so that, it only includes the employees who do not have a value in the "manager_id" column, which indicates whether or not the "manager_id" column is null.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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