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SQL AVG() Function


AVG () function

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

SQL AVG () syntax

SELECT AVG (column_name) FROM table_name


Demo database

In this tutorial, we will use the RUNOOB sample database.

Here is the data from the "access_log" table:

+-----+---------+-------+------------+
| aid | site_id | count | date       |
+-----+---------+-------+------------+
|   1 |       1 |    45 | 2016-05-10 |
|   2 |       3 |   100 | 2016-05-13 |
|   3 |       1 |   230 | 2016-05-14 |
|   4 |       2 |    10 | 2016-05-14 |
|   5 |       5 |   205 | 2016-05-14 |
|   6 |       4 |    13 | 2016-05-15 |
|   7 |       3 |   220 | 2016-05-15 |
|   8 |       5 |   545 | 2016-05-16 |
|   9 |       3 |   201 | 2016-05-17 |
+-----+---------+-------+------------+


SQL AVG () example

The following SQL statement gets the average from the "count" column of the "access_log" table:

Example

SELECT AVG (count) AS CountAverage FROM access_log;

The result of executing the above SQL is as follows:

The following SQL statement selects "site_id" and "count":

Examples

SELECT site_id, count FROM access_log
WHERE count > (SELECT AVG(count) FROM access_log);

The result of executing the above SQL is as follows: