Displaying PHP Many to Many Relationship - php

Question

Hi everyone im new at php so here is my code i am having trouble displaying php in many to many relationship im doing a student information system
here is my database
student
student_id
name
address
course
subject
subject_id
subject_name
subject_code
student_subject
subject_id
student_id
Here is my query
$sql = "SELECT subject_name
FROM subject
LEFT JOIN student_subject ON (student.student_id = 'student_id')
LEFT JOIN subject ON (subject.subject_id = 'subject_id' )";
$records = mysql_query($sql);
and now this is my code to display it please help me how to display this example i just only want to display the subject name and the subject code
while($student=mysql_fetch_array($records)){
echo $student['subject_name'];
echo $student['subject_code'];
}
this is only sample because this is only what i want to dispaly please help me thanks sorry for my bad english. cant search anything about displaying many to many relationship in google i can see some query but i cant search about the code i tried many but i always failed thank you so much
desired Output:
Subject Name ---|--- Subject CODE
ICT___________||_________IT 101
ALGEBRA_______||_________ MATH101
remove the underscore in your vision cant fix the output new here in stackoverflow

Answer 1

<?php
$con = mysql_connect("localhost", "root", "") or die('There is an error to connect DB' . mysql_error());
mysql_select_db('test') or die ('Unable to select DB' . mysql_error());
$query = 'SELECT ST.student_id, ST.name, ST.address, SB.subject_name, SB.subject_code FROM student ST, subject SB, `student_subject` STSB WHERE STSB.student_id=ST.student_id AND STSB.subject_id=SB.subject_id';
$query = mysql_query($query) or die('Unable to execute query' . mysql_error());
if ($query) {
$str = '';
$header = '<tr><td>Student ID</td><td>Name</td><td>Address</td><td>Subject</td><td>Subject Code</td></tr>';
while ($row = mysql_fetch_array($query)) {
$str .= '<tr>';
$student_id = $row['student_id'];
$name = $row['name'];
$address = $row['address'];
$subject = $row['subject_name'];
$subject_code = $row['subject_code'];
$str .= '<td>' . $student_id . '</td>';
$str .= '<td>' . $name . '</td>';
$str .= '<td>' . $address . '</td>';
$str .= '<td>' . $subject . '</td>';
$str .= '<td>' . $subject_code . '</td>';
$str .= '</tr>';
}
if ($str) {
$table = '<table border="1">' . $header . $str . '</table>';
} else {
$tdata = '<tr><td colspan="5">No data found</td></tr>';
$table = '<table border="1">' . $header . $tdata . '</table>';
}
echo $table;
}
Output will be like this: