SQL 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_IdOrderDateOrderPriceCustomer
12008/11/121000Hansen
22008/10/231600Nilsen
32008/09/02700Hansen
42008/09/03300Hansen
52008/08/302000Jensen
62008/10/04100Nilsen

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

ow we want to find the customers that have an OrderPrice value higher than 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

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