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SQL QuizSQL AVG() Function
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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 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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