---
tags:
  - Programming_Languages
  - Databases
  - sql
---

# SQL Aggregate functions

## Count return with custom variable 

````sql
SELECT COUNT(*) AS total_sales
FROM SALES
````

## Sum

````sql
SELECT SUM(price) as total_value
FROM sales
````

## Average 

````sql
SELECT AVG(price) as average_income
FROM sales
````

## Applying aggregate function with sorting applied

````sql
SELECT COUNT(*) AS total_sales
FROM sales
GROUP BY employee_id
````