PHP MySQL Query Use GROUP BY

PHP MySQL Aggregate Function GROUP BY Clause

The GROUP BY Clause is used to group the return data for the aggregate function.

Syntax

This group user by user grade.

SELECT COUNT(em.id) as total, em.grade
FROM employee em GROUP BY em.grade;

Example 1

<?php

define('HOST', 'localhost');
define('USER', 'root');
define('PASS', 'yeething');
define('DBNAME', 'woowood');

$connection = mysql_connect(HOST, USER, PASS)
		  or die("can not connect to the server!<br/>");


$rdb = mysql_select_db(DBNAME)
		  or die("The " . DBNAME . "database could not be selected");

$sel_query = "SELECT COUNT(em.id) as total, em.grade
FROM employee em GROUP BY em.grade";

$result = mysql_query($sel_query, $connection) or die(mysql_error($connection));
echo '<table border="1">';
echo '<tr><th>COUNT PEOPLE</th>
			 <th>Grade</th>
	   </tr>';
while ($row = mysql_fetch_assoc($result)) {
	echo '<tr>';
	foreach ($row as $value) {
		echo '<td>' . $value . '</td>';
	}
	echo "</tr>";
}
echo '</table>';

mysql_close($connection);
?> 

Output

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1. MySQL Connect
2. Create Database
3. Connect to Database
4. Delete Database
5. Create Table
6. Insert Record
7. Insert From Array
8. Insert From File
9. Update Record
10. Query Single Record
11. Query Multiple Records
12. Query Uses LIMIT
13. Query Uses ORDER BY
14. Delete Table

1. Create Two Tables for this section tutorial
2. Query Uses AND Operator
3. Query Uses OR Operator
4. Query Uses INNER JOIN
5. Query Uses LEFT OUTER JOIN
6. Query Uses RIGHT OUTER JOIN
7. Query with Subquery

1. MySQL Aggregate Count
2. MySQL Aggregate SUM
3. MySQL Aggregate MAX
4. MySQL Aggregate MIN
5. MySQL Aggregate AVG
6. MySQL Query Uses GROUP BY
7. MySQL Query Uses Having

1. PHP MySQL Create Date
2. PHP MySQL Insert Date
3. PHP MySQL Query Date