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SQL Aggregate Max

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SQL Aggregate Max is used to find the highest value of the column in a table

SQL Aggregate Max

     

SQL Aggregate Max is used to find the highest value of the column in a table

Understand with Example

The Tutorial illustrate an example from SQL Aggregate Max. In this Example we create a table Stu_Table. The create table statement  create a table 'Stu_Table'. 

Create Table Stu_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'.

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

+--------+----------+-----------+--------+-------+
| 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 Query below returns you the records from select statement. The GROUPCONCAT  is used to combine the result value of field. The max(marks) compute the maximum value of the field 'marks'.

select stu_id, stu_name, GROUP_CONCAT(marks) as marks ,
max(marks) from stu_table group by stu_id

Result

+--------+----------+----------------+------------+
| stu_id | stu_name | marks          | max(marks) |
+--------+----------+----------------+------------+
| 1      | Komal    | 45,65,47,65,45 | 65         |
| 2      | Ajay     | 46,56,56,53,56 | 56         |
| 3      | Rakesh   | 67,57,37,67,63 | 67         |
+--------+----------+----------------+------------+
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Posted on: December 31, 2008

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