In article we will explain how to write a MySQL query to find the highest salary from each department from the employees table.

Read Also : Find The Nth Highest Employee Salary From An Employee Table In MySql

Find the highest salary from each department

Let’s create a simple example of employees table. We will populate this table with id, name, salary and department of employees.

SELECT * FROM employees;

The following MySQL statement find the maximum salary from each department, you will be required to use the GROUP BY clause with the SELECT query.

SELECT department, MAX(salary)  
FROM employees 
GROUP BY department
ORDER BY MAX(salary) DESC;

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In article we will explain how to write a MySQL query to Retrieve highest and lowest salary from the employees table.

Read Also : MySQL Query To Find The Second Highest Salary

Retrieve highest and lowest salary From An employees Table

First let’s create a simple example of employees table. We will populate this table with id, name, salary and department of employees.

SELECT * FROM employees;

The following MySQL statement finds the highest and lowest salary From An employees Table:

SELECT MAX(salary), MIN(salary)
FROM employees;

In above MySQl query we used-
The MySQL MAX function returns the maximum value in a set of values.
The MySQL MIN function returns the minimum value in a set of values.

The post Retrieve highest and lowest salary From An Employee Table In MySql appeared first on The Code Developer.

Find the Nth highest employee salary from an Employee table is the most common question asked in interviews. There are many ways to get Nth highest employee salary based upon which database you are using. In this article i am using MySQL database for demonstration.

Read Also : MySQL Query To Find The Second Highest Salary

Find the Nth highest employee salary

Let’s create a simple example of employees table. We will populate this table with id, name, salary and department of employees.

SELECT * FROM employees;

Method 1 – Nth highest salary in MySQL using LIMIT clause:

SELECT DISTINCT(salary) FROM employees ORDER BY salary DESC LIMIT N-1, 1;

2nd highest salary in MySQL using LIMIT clause:

SELECT DISTINCT(salary) FROM employees ORDER BY salary DESC LIMIT 1,1;

3rd highest salary in MySQL using LIMIT clause:

SELECT DISTINCT(salary) FROM employees ORDER BY salary DESC LIMIT 2,1;

Method 2 – Nth highest salary in MySQL using SubQuery:

SELECT DISTINCT( salary ) 
FROM   employees Emp1 
WHERE  N = (SELECT Count(DISTINCT ( Emp2.salary )) 
                FROM   employees Emp2 
                WHERE  Emp2.salary >= Emp1.salary); 

Here, replace the N with any number. For example, if you want to find 5th highest salary , then replace N with 5 like below query –

SELECT DISTINCT( salary ) 
FROM   employees Emp1 
WHERE  5 = (SELECT Count(DISTINCT ( Emp2.salary )) 
            FROM   employees Emp2 
            WHERE  Emp2.salary >= Emp1.salary);

Now suppose based on the above table you want to get all employees have Nth highest salary with all details. For example, if you want to find all employees have 3rd highest salary with all details:

SELECT * 
FROM   employees Emp1 
WHERE  3 = (SELECT Count(DISTINCT ( Emp2.salary )) 
            FROM   employees Emp2 
            WHERE  Emp2.salary >= Emp1.salary);

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Introduction to MySQL AVG Function

This MySQL tutorial explains how to use the MySQL AVG Function with syntax and examples. The AVG() function returns the average value of a numeric column.

AVG() Syntax

SELECT AVG(column_name)
FROM table_name
WHERE condition;

To understand MySQL AVG Function, consider an “books” table, which is having the following records:

SELECT * FROM books;

AVG Function Example

Examples 1:

The following SQL statement finds the average price of all books:

SELECT AVG(Price) AS  "Avg Price"
FROM books;

Below is a selection from the “employees” table, which is having the following records:

SELECT * FROM employees;

Example 2: With Single Expression

Now suppose based on the above table you want to know how the average salary of all employees whose salary is above 6000.

SELECT AVG(salary) AS "Avg Salary"
FROM employees
WHERE salary > 6000;

Example 3: Using GROUP BY

In some cases, you will be required to use the GROUP BY clause with the AVG function.

For example, you could also use the AVG function to calculate average salary for each department:

SELECT department, AVG(salary) AS "Avg salary"
FROM employees
GROUP BY department;

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