SQL AVG() function

AVG() function

The AVG() function returns the average value of the numeric column.

SQL AVG() syntax 

SELECT AVG(column_name)
FROM table_name
WHERE condition;

Demonstrate the database

In this tutorial, we'll use the famous Northwind sample database.

Here's the data from the Products table:

ProductID ProductName SupplierID CategoryID Unit Price
1 Chais 1 1 10 boxes x 20 bags 18
2 Chang 1 1 24 - 12 oz bottles 19
3 Aniseed Syrup 1 2 12 - 550 ml bottles 10
4 Chef Anton's Cajun Seasoning 2 2 48 - 6 oz jars 22
5 Chef Anton's Gumbo Mix 2 2 36 boxes 21.35

SQL AVG() instance

The following SQL statement finds the average price for all products:

SELECT AVG(Price)
FROM Products;

The following SQL statement selects the "ProductName" and "Price" records with prices above the average price:

SELECT ProductName, Price FROM Products
WHERE Price>(SELECT AVG(Price) FROM Products);