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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Introduction to MySQL SUM Function

This MySQL tutorial explains how to use the MySQL SUM function with syntax and examples. The MySQL SUM function returns the summed value of an expression.

SUM() Syntax

SELECT SUM(column_name)
FROM table_name
WHERE condition;

To understand SUM function, consider an “OrderDetails” table, which is having the following records:

SELECT * FROM OrderDetails;

The following MySQL statement finds the sum of the “Quantity” fields in the “OrderDetails” table:

SELECT SUM(Quantity) AS TotalQuantity
FROM OrderDetails;

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Introduction to MySQL MIN Function

This MySQL tutorial explains how to use the MIN function with syntax and examples. The MySQL MIN function returns the minimum value in a set of values.

MIN() Syntax

SELECT MIN(column_name)
FROM table_name
WHERE condition;

To understand MIN function, consider an “books” table, which is having the following records:

SELECT * FROM books;

The following MySQL statement finds the price of the most cheapest book:

SELECT MIN(Price) AS SmallestPrice
FROM books;

The following MySQL statement finds the price of the most cheapest book in each author, sorted low to high:

SELECT MIN(Price) AS SmallestPrice, Author
FROM books
GROUP BY Author
ORDER BY SmallestPrice ASC;

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Introduction to MySQL MAX Function

This MySQL tutorial explains how to use the MAX function with syntax and examples. The MySQL MAX function returns the maximum value in a set of values.

MAX() Syntax

SELECT MAX(column_name)
FROM table_name
WHERE condition;

To understand MAX function, consider an “books” table, which is having the following records:

SELECT * FROM books;

The following MySQL statement finds the price of the most expensive book:

SELECT MAX(Price) AS MaxPrice
FROM books;

The following MySQL statement finds the price of the most expensive book in each author, sorted high to low:

SELECT MAX(Price) AS MaxPrice, Author
FROM books
GROUP BY Author
ORDER BY MaxPrice DESC;

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