SQL Exercise: Sort unique jobs by department in descending order

SQL employee Database: Exercise-76 with Solution

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76. From the following table, write a SQL query to list the unique jobs of department 2001 and 3001 in descending order. Return job name.

Pictorial Presentation:

Sample table: employees

Sample Solution:

SELECT DISTINCT job_name
FROM employees
WHERE dep_id IN (2001,
                 3001)
ORDER BY job_name DESC;

Sample Output:

 job_name
----------
 SALESMAN
 MANAGER
 CLERK
 ANALYST
(4 rows)

Explanation:

The said query in SQL that selects the distinct job names of employees from the 'employees' table who work in departments 2001 or 3001, and orders the results in descending order by job name.

The DISTINCT keyword eliminates duplicates in the result set, ensuring that each job name appears only once.

The WHERE clause filters the results to only include employees who work in departments 2001 or 3001.

The ORDER BY clause orders the result set by job name in descending order.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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