SQL AVG() Function

The SQL AVG() Function

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

Find the average price of all products:

SELECT AVG(Price)
FROM Products;

Note: NULL values are ignored.

SELECT AVG(column_name) FROM table_name WHERE condition;

Below is a selection from the Products table used in the examples:

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

You can add a WHERE clause to specify conditions:

Return the average price of products in category 1:

SELECT AVG(Price)
FROM Products
WHERE CategoryID = 1;

Give the AVG column a name by using the AS keyword.

Name the column "average price":

SELECT AVG(Price) AS [average price]
FROM Products;

To list all records with a higher price than average, we can use the AVG() function in a sub query:

Return all products with a higher price than the average price:

SELECT * FROM Products
WHERE price > (SELECT AVG(price) FROM Products);