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SQL Avg Group By

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SQL Avg Group By helps you to find out average value of numeric field in a table.

SQL Avg Group By

     

SQL Avg Group By helps you to find out average value of numeric field in a table. The SQL GROUP BY clause is used with the SQL aggregate functions and indicates the group where selected rows are placed.

Understand with Example

In this Tutorial we help you to grasp SQL Avg Group By by giving a demonstrative example. The Tutorial describe you a code, that create a table 'Stu_Table'.  The create table statement create a table Stu_Table.

Create Table Stu_Table

SQL statement to create table :

create table Stu_Table(Stu_Id varchar(2), Stu_Name varchar(15), 
Stu_Class  varchar(10),sub_id varchar(2),marks varchar(3));

Insert Data into Stu_Table

The insert into statement add the records or rows to the table 'Stu_Table'.

SQL statement to insert data into table:

insert into Stu_Table values(1,'Komal',10,1,45);
insert into Stu_Table values(2,'Ajay',10,1,56);
insert into Stu_Table values(3,'Rakesh',10,1,67);

insert into Stu_Table values(1,'Komal',10,2,47);
insert into Stu_Table values(2,'Ajay',10,2,53);
insert into Stu_Table values(3,'Rakesh',10,2,57);

insert into Stu_Table values(1,'Komal',10,3,45);
insert into Stu_Table values(2,'Ajay',10,3,56);
insert into Stu_Table values(3,'Rakesh',10,3,67);

insert into Stu_Table values(1,'Komal',10,4,65);
insert into Stu_Table values(2,'Ajay',10,4,56);
insert into Stu_Table values(3,'Rakesh',10,4,37);

insert into Stu_Table values(1,'Komal',10,5,65);
insert into Stu_Table values(2,'Ajay',10,5,46);
insert into Stu_Table values(3,'Rakesh',10,5,63);

Stu_Table

Records in the table:

+--------+----------+-----------+--------+-------+
| Stu_Id | Stu_Name | Stu_Class | sub_id | marks |
+--------+----------+-----------+--------+-------+
| 1      | Komal    | 10        | 1      | 45    |
| 2      | Ajay     | 10        | 1      | 56    |
| 3      | Rakesh   | 10        | 1      | 67    |
| 1      | Komal    | 10        | 2      | 47    |
| 2      | Ajay     | 10        | 2      | 53    |
| 3      | Rakesh   | 10        | 2      | 57    |
| 1      | Komal    | 10        | 3      | 45    |
| 2      | Ajay     | 10        | 3      | 56    |
| 3      | Rakesh   | 10        | 3      | 67    |
| 1      | Komal    | 10        | 4      | 65    |
| 2      | Ajay     | 10        | 4      | 56    |
| 3      | Rakesh   | 10        | 4      | 37    |
| 1      | Komal    | 10        | 5      | 65    |
| 2      | Ajay     | 10        | 5      | 46    |
| 3      | Rakesh   | 10        | 5      | 63    |
+--------+----------+-----------+--------+-------+

Query

The given below syntax show you the average marks  records of a numeric field in a table. The Group By clause is used with the SQL aggregate functions and indicates the group where selected rows are placed.

select stu_id, stu_name,GROUP_CONCAT(marks) as marks, 
sum(marks)as total ,avg(marks) as per
from stu_table group by stu_id;

Result

+--------+----------+----------------+-------+------+
| stu_id | stu_name | marks          | total | per  |
+--------+----------+----------------+-------+------+
| 1      | Komal    | 45,65,47,65,45 | 267   | 53.4 |
| 2      | Ajay     | 56,56,56,53,56 | 277   | 55.4 |
| 3      | Rakesh   | 67,57,67,67,63 | 321   | 64.2 |
+--------+----------+----------------+-------+------+
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Posted on: December 20, 2008

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