MySQL Aggregate Function Exercises: List the number of jobs available in the employees table

MySQL Aggregate Function: Exercise-1 with Solution

Write a query to list the number of jobs 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

MySQL Code Editor:

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