MAX() - MySQL Aggregate Function

The MAX() function in MySQL is used to find the maximum value of a selected column. In this tutorial, we'll discuss the syntax, example, output, explanation, use, important points, and summary of the MAX() function.

Syntax

The syntax for the MAX() function is as follows:

SELECT MAX(column_name) FROM table_name;

In this syntax:

• column_name: The name of the column for which you want to find the maximum value.
• table_name: The name of the table from which you want to retrieve the data.

Example

Let's say we have a table called "sales", which has the following columns: "id", "customer_name", and "amount". We want to find the maximum value of the "amount" column. Here's how we can do it using the MAX() function:

SELECT MAX(amount) FROM sales;

Output

When we run the example code above, the output will be the maximum value of the "amount" column in the "sales" table.

Explanation

In the example above, we used the MAX() function to find the maximum value of the "amount" column in the "sales" table. The function returns the highest number in the specified column.

Use

The MAX() function is useful when you want to find the highest or largest value in a column. For example, you may want to find the highest sale of a product, the highest score in a game, or the tallest person in a group.

Important Points

• The MAX() function only works with numerical values. It cannot be used with strings or dates.
• If a column contains NULL values, the MAX() function will return NULL.
• You can combine the MAX() function with other functions, such as COUNT() or SUM(), to get more complex calculations.

Summary

In this tutorial, we discussed the syntax, example, output, explanation, use, important points, and summary of the MAX() function in MySQL. With this knowledge, you can now use the function to find the highest numerical value in a column of your MySQL database.