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:
Now 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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