Calculate average of numbers in a column MySQL query?

Calculate the average of numbers in a column with the help of MySQL aggregate function AVG().

The syntax is as follows −

select avg(yourColumnName) as anyVariableName from yourTableName;

To understand the above concept, let us create a table. The following is the query to create a table.

mysql> create table AverageCalculateDemo
   −> (
      −> SubjectMarks int
   −> );
Query OK, 0 rows affected (0.67 sec)

The following is the query to insert some records into the table −

mysql> insert into AverageCalculateDemo values(70);
Query OK, 1 row affected (0.14 sec)

mysql> insert into AverageCalculateDemo values(80);
Query OK, 1 row affected (0.19 sec)

mysql> insert into AverageCalculateDemo values(65);
Query OK, 1 row affected (0.13 sec)

mysql> insert into AverageCalculateDemo values(55);
Query OK, 1 row affected (0.13 sec)

mysql> insert into AverageCalculateDemo values(60);
Query OK, 1 row affected (0.23 sec)

Display all values with the help of a select statement. The query is as follows to display all records −

mysql> select *from AverageCalculateDemo;

The following is the output −

+--------------+
| SubjectMarks |
+--------------+
|           70 |
|           80 |
|           65 |
|           55 |
|           60 |
+--------------+
5 rows in set (0.00 sec)

Here is the query that calculates the average of the column in MySQL −

mysql> select avg(SubjectMarks) as AverageOf4Numbers from AverageCalculateDemo;

The following is the output that displays the average −

+-------------------+
| AverageOf4Numbers |
+-------------------+
| 66.0000           |
+-------------------+
1 row in set (0.00 sec)