SQL AVG() Function

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# SQL AVG() Function

## The AVG() Function

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

### SQL AVG() Syntax

    SELECT AVG(column_name) FROM table_name

## SQL AVG() Example

We have the following "Orders" table:

O_Id | OrderDate | OrderPrice | Customer
--- | --- | --- | ---
1 | 2008/11/12 | 1000 | Hansen
2 | 2008/10/23 | 1600 | Nilsen
3 | 2008/09/02 | 700 | Hansen
4 | 2008/09/03 | 300 | Hansen
5 | 2008/08/30 | 2000 | Jensen
6 | 2008/10/04 | 100 | Nilsen

Now we want to find the average value of the "OrderPrice" fields.

We use the following SQL statement:

    SELECT AVG(OrderPrice) AS OrderAverage FROM Orders

The result-set will look like this:

OrderAverage
950

Now we want to find the customers that have an OrderPrice value higher then the average OrderPrice value.

We use the following SQL statement:

    SELECT Customer FROM Orders
    WHERE OrderPrice>(SELECT AVG(OrderPrice) FROM Orders)

The result-set will look like this:

Customer
Hansen
Nilsen
Jensen

From http://www.w3schools.com (Copyright Refsnes Data)