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PHP Mysql Group By
Posted on: January 23, 2009 at 12:00 AM

PHP Mysql Group By is used to establish a relation between the PHP on the server side and Mysql database on the backend.

PHP Mysql Group By

PHP Mysql Group By is used to establish a relation between the PHP on the server side and Mysql database on the backend.

Understand with Example

The Tutorial illustrate an example from PHP Mysql Group By. To understand and grasp the example we create a table 'Stu' that specifies the required fieldnames and datatypes respectively.

Create table Stu:

CREATE TABLE `stu` (                    
          `Id` int(11) default NULL,            
          `Name` varbinary(15) default NULL,    
          `Marks` int(11) default NULL          
        );

Insert data into Stu:

The insert into keyword is used to add the records or rows to the table 'Stu'.

Insert Into Stu values(1,'Ajay',89);
Insert Into Stu values(2,'Bhanu',67);
Insert Into Stu values(4,'Rakesh',67);
Insert Into Stu values(5,'Santosh',90);
Insert Into Stu values(3,'Komal',78);

Insert Into Stu values(1,'Ajay',45);
Insert Into Stu values(2,'Bhanu',67);
Insert Into Stu values(4,'Rakesh',87);
Insert Into Stu values(5,'Santosh',40);
Insert Into Stu values(3,'Komal',71);

PHP_SQL_group_by.php:

The PHP_SQL_group by code include the php server side scripting that uses host name, user, password and database to return the maximum marks, Id and name records to group the result set by column id from table 'Stu' in your browser.

<html>
<body>
<?php

$host = "localhost";
$user = "root";
$password = "root";
$database = "komal";

$connection = mysql_connect($host,$user,$password) 
	or die("Could not connect: ".mysql_error());

mysql_select_db($database,$connection) 
	or die("Error in selecting the database:".mysql_error());

$sql="select Id, Name ,max(Marks) from stu group by id";

$sql_result=mysql_query($sql,$connection) 
	or exit("Sql Error".mysql_error());

$sql_num=mysql_num_rows($sql_result);

echo "<table bgcolor=\"#F5F5FF\">";
echo "<tr>";
echo "<td ><b>Id</b></td> <td><b>Name</b></td>
	<td><b>Max(Marks)</b></td>";
echo "</tr>";
while($sql_row=mysql_fetch_array($sql_result))
{
	$id=$sql_row["Id"];
	$name=$sql_row["Name"];
	$marks=$sql_row["max(Marks)"];

	echo "<tr><td>".$id."</td>";
	echo "<td>".$name."</td>";
	echo "<td>".$marks."</td></tr>";
}	
echo "</table>"
?>
</body>
</html>

Result

Id	Name	Max(Marks)
1	Ajay	89
2	Bhanu	67
3	Komal	78
4	Rakesh	87
5	Santosh	90

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