SQL AVG function

Source: Internet
Author: User

Definition and usage

The AVG function returns the average of a numeric column. NULL values are not included in the calculation.

SQL AVG () syntax
SELECT AVG (column_name) from table_name
SQL AVG () instance

We have the following "Orders" table:

o_id OrderDate Orderprice Customer
1 2008/12/29 1000 Bush
2 2008/11/23 1600 Carter
3 2008/10/05 700 Bush
4 2008/09/28 300 Bush
5 2008/08/06 2000 Adams
6 2008/07/21 100 Carter
Example 1

Now, we want to calculate the average of the "Orderprice" field.

We use the following SQL statement:

SELECT AVG (Orderprice) as Orderaverage from Orders

The result set looks like this:

Orderaverage
950
Example 2

Now, we want to find customers with Orderprice values above the Orderprice average.

We use the following SQL statement:

Select Customer from Orderswhere orderprice> (select AVG (orderprice) from Orders)

The result set looks like this:

Customer
Bush
Carter
Adams

SQL AVG function

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