Basic SELECT statement: Get the number of designations where employees do their jobs

MySQL Basic Select Statement: Exercise-10 with Solution

Write a query to get the number of designations available in the employees table.

Sample table: employees

Code:

SELECT COUNT(DISTINCT job_id) 
    FROM employees;

Relational Algebra Expression:

Relational Algebra Tree:

Pictorial Presentation of the above query

Result :

MySQL Code Editor:

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