MySQL query to calculate the average of values in a row?

To calculate the average of values in a row in MySQL, use the following syntax

SELECT (yourTableName.yourColumnName1+yourTableName.yourColumnName2+yourTableName.yourColumnName3+,..........N)/numberOfColumns AS anyAliasName FROM yourTableName;

To understand the above syntax, let us create a table. The query to create a table is as follows

mysql> create table calculateAverageDemo
   -> (
   -> x int,
   -> y int,
   -> z int
   -> );
Query OK, 0 rows affected (1.41 sec)

Insert some records in the table using insert command.

The query is as follows

mysql> insert into calculateAverageDemo values(10,20,30);
Query OK, 1 row affected (0.78 sec)
mysql> insert into calculateAverageDemo values(40,50,70);
Query OK, 1 row affected (0.26 sec)
mysql> insert into calculateAverageDemo values(80,90,220);
Query OK, 1 row affected (0.43 sec)

Display all records from the table using select statement.

The query is as follows

mysql> select *from calculateAverageDemo;

The following is the output

+------+------+------+
| x    | y    | z    |
+------+------+------+
| 10   | 20   | 30   |
| 40   | 50   | 70   |
| 80   | 90   | 220  |
+------+------+------+
3 rows in set (0.00 sec)

Here is the query to calculate average of values in a row

mysql> select (calculateAverageDemo.x+calculateAverageDemo.y+calculateAverageDemo.z)/3
-> AS Average from calculateAverageDemo;

The following is the output

+----------+
| Average  |
+----------+
| 20.0000  |
| 53.3333  |
| 130.0000 |
+----------+
3 rows in set (0.06 sec)