Multiple Checkbox Update and Delete Query - php

Question

I want to update tutor table and tutor course table, i have multiple checkbox for tutor course and if a teacher update his course or other info both table should also update.... tutor can increase or decrease course. I'm using following query but its not working for me
$update_content = mysql_query("UPDATE wp_tutor
JOIN wp_tutor_courses
ON wp_tutor.tutor_id=wp_tutor_courses.tutor_id
SET wp_tutor.tutor_name='$tNameVar',
wp_tutor.tutor_qualification='$tQualVar',
wp_tutor.tutor_skype='$tSkyVar',
wp_tutor.tutor_specialization='$tuSAreaVar',
wp_tutor.tutor_gender='$tuGenderVar',
wp_tutor_courses.course_id='$tuCourseVar'
WHERE tutor_id='$tid'");
<table cellpadding="5" cellspacing="0" border="1">
<caption>Tutor Table</caption>
<thead>
<tr>
<th>Tutor ID</th>
<th>Tutor Name</th>
<th>Tutor Skype ID</th>
<th>Tutor Specialization</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center">1</td>
<td align="center">Kashif</td>
<td align="center">kashiflatif</td>
<td align="center">Financial Accounting</td>
</tr>
<tr>
<td align="center">2</td>
<td align="center">Ammar</td>
<td align="center">ammar.90</td>
<td align="center">Research Methods</td>
</tr>
<tr>
<td align="center">3</td>
<td align="center">Bilal</td>
<td align="center">bilalhaider95</td>
<td align="center">Islamic Bond & Practices</td>
</tr>
</tbody>
</table>
<br />
<br />
<table cellpadding="5" cellspacing="0" border="1" style="float:left">
<caption>Tutor Course Table</caption>
<thead>
<tr>
<th>Tutor Course ID</th>
<th>Tutor ID</th>
<th>Course ID</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
</tr>
<tr>
<td align="center">2</td>
<td align="center">1</td>
<td align="center">2</td>
</tr>
<tr>
<td align="center">3</td>
<td align="center">1</td>
<td align="center">3</td>
</tr>
<tr>
<td align="center">4</td>
<td align="center">2</td>
<td align="center">1</td>
</tr>
<tr>
<td align="center">5</td>
<td align="center">2</td>
<td align="center">3</td>
</tr>
<tr>
<td align="center">6</td>
<td align="center">3</td>
<td align="center">1</td>
</tr>
</tbody>
</table>
<table cellpadding="5" cellspacing="0" border="1" style="float:left; margin-left:20px;">
<caption>Course Table</caption>
<thead>
<tr>
<th>Course ID</th>
<th>Course Name</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center">1</td>
<td align="center">Certificate</td>
</tr>
<tr>
<td align="center">2</td>
<td align="center">Diploma</td>
</tr>
<tr>
<td align="center">3</td>
<td align="center">PGD</td>
</tr>
</tbody>
</table>

Answer 1

Try this:
$update_content = mysql_query("UPDATE wp_tutor a
INNER JOIN wp_tutor_courses b
ON a.tutor_id=b.tutor_id
SET a.tutor_name='$tNameVar',
a.tutor_qualification='$tQualVar',
a.tutor_skype='$tSkyVar',
a.tutor_specialization='$tuSAreaVar',
a.tutor_gender='$tuGenderVar',
b.course_id='$tuCourseVar'
WHERE a.tutor_id='$tid'");