SQL provides several aggregate functions that allow you to perform calculations on a set of values. Some of the most commonly used aggregate functions are:

1. COUNT: This function returns the number of rows in a result set. The syntax for this function is:

COUNT(*)

Here is an example:

SELECT COUNT(*) FROM employees;

The result of this query will be the number of rows in the employees table.

2. SUM: This function returns the sum of values in a specified column. The syntax for this function is:

SUM(column name)

Here is an example:

SELECT SUM(salary) FROM employees;

The result of this query will be the total salary of all employees in the employees table.

3. AVG: This function returns the average value of a specified column. The syntax for this function is:

AVG(column name)

Here is an example:

SELECT AVG(salary) FROM employees;

The result of this query will be the average salary of all employees in the employees table.

4. MIN and MAX: These functions return the minimum and maximum values, respectively, of a specified column. The syntax for these functions is:

MIN(column name)
MAX(column name)

Here is an example:

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

The result of the first query will be the minimum salary of all employees in the employees table, and the result of the second query will be the maximum salary.

In conclusion, SQL provides several aggregate functions for performing calculations on a set of values. These functions are useful for summarizing and analyzing data, and are commonly used in business intelligence and data analysis applications.

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