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Basic SELECT statement: Get the average salary and number of employees

MySQL Basic Select Statement: Exercise-8 with Solution

Write a query to get the average salary and number of employees in the employees table.

Sample table: employees


Code:

-- Calculating the average salary and counting the total number of employees
SELECT AVG(salary), COUNT(*) 
-- Selecting data from the employees table
FROM employees;

Explanation:

  • This SQL query calculates the average salary and counts the total number of employees in the employees table.
  • The AVG() function calculates the average value of the specified column (salary in this case).
  • The COUNT(*) function counts the number of rows in the table, which effectively counts the total number of employees.

Relational Algebra Expression:

Relational Algebra Expression: Basic SELECT statement: Get the average salary and number of employees.

Relational Algebra Tree:

Relational Algebra Tree: Basic SELECT statement: Basic SELECT statement: Get the average salary and number of employees.

Pictorial Presentation of the above query


Result :


MySQL Code Editor:

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Previous: Write a query to get the maximum and minimum salary from employees table.
Next: Write a query to get the number of employees working with the company.

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