SQL Exercise: Display the unique designations for the employees

SQL employee Database: Exercise-3 with Solution

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3. From the following table, write a SQL query to find the unique designations of the employees. Return job name.

Sample table: employees

Pictorial Presentation:

Sample Solution:

SELECT DISTINCT job_name 
FROM employees;

Sample Output:

 job_name
-----------
 CLERK
 SALESMAN
 MANAGER
 PRESIDENT
 ANALYST
(5 rows)

Explanation:

The said query in SQL that retrieves all distinct (unique) values in the "job_name" column of the 'employees' table .

The DISTINCT keyword eliminates duplicate values from the result set, so this query will only return a list of unique job names that are stored in the 'employees' table.

Relational Algebra Expression:

Relational Algebra Tree:

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Sample Database: employee

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