What is the role of the MAX function in SQL and in what cases is it used?

The MAX function in SQL is used to find the maximum value in a table column. It is often used to determine the highest number, the latest date, or the maximum value for other data types in a set of records.

Example of usage:

SELECT MAX(salary) AS max_salary FROM employees;

This query will return the highest salary among all employees.

MAX is useful in data analysis when you need to find the upper boundary of values, such as the maximum score, maximum price, maximum date, etc.