MySQL Aggregate Function Exercises: Get the average salary and number of employees working the department 90

MySQL Aggregate Function: Exercise-5 with Solution

Write a query to get the average salary and number of employees working the department 90.

Sample table: employees

Code:

SELECT AVG(salary),count(*) 
FROM employees 
WHERE department_id = 90;

Relational Algebra Expression:

Relational Algebra Tree:

Pictorial Presentation of the above query

MySQL Code Editor:

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