html if statement

[trtcom1]

Hi there,
I have 3 tables:
Student (studentNum,firstName,lastName,CourseName),
course (courseID,courseTotalCapacity),
course_allocation (studentNum,courseID).
I have 3 courses, MATHS=101,BIOLOGY=102,CHEMISTRY=103.
My form has the following:

<SELECT NAME="CourseName">
<OPTION VALUE="MATHS">MATHS</OPTION>
<OPTION VALUE="BIOLOGY">BIOLOGY</OPTION>
<OPTION VALUE="CHEMISTRY">CHEMISTRY</OPTION>
</SELECT></td></tr>

<SELECT NAME="courseID">
<OPTION VALUE="101">MATHS=101</OPTION>
<OPTION VALUE="102">BIOLOGY=102</OPTION>
<OPTION VALUE="103">CHEMISTRY=103</OPTION>
</SELECT>

I would like to have some kind of a if statement, that if the user chooses the CourseName MATHS, then the courseID 101 is entered to the course and course_allocation tables and MATHS entered to the CourseName table.
As it is the user has to choose MATHS and choose MATHS=101, then click submit.
Any help, please.

[nav33n]

What is the problem ? You would be selecting CourseName and courseID. So, when you post the form, You will have "MATHS" in $_POST and "101" in $_POST. Then it is all about the insert query.
Or am I missing something ? :-/

[Airshow]

trtcom1,

I think it's simple - to select a course, you need just one select menu, not two.

<SELECT NAME="course">
<OPTION VALUE="101">MATHS</OPTION>
<OPTION VALUE="102">BIOLOGY</OPTION>
<OPTION VALUE="103">CHEMISTRY</OPTION>
</SELECT>

All the intelligence that marries up the courseIds with courseNames should reside server-side. Hence the user knows courses by name (because that's what is presented to him/her) whilst the server-side script (the php that is requested when the form is submitted) knows the courses by id (which will typically be a primary key in a database record).

Airshow

[almostbob]

the student table does not need the text course names
the reporting logic can print the text names if necessary from the course table

student (studentNum,firstName,lastName,),
course (courseID, CourseName,courseTotalCapacity),
course_allocation (studentNum,courseID)

one link between each datatable

[trtcom1]

Thank you very much for your comments and help. This thread can be considered as solved. This is my final solution:
Here the html select:

<SELECT NAME="courseID">
<OPTION VALUE="101">MATHS</OPTION>
<OPTION VALUE="102">BIOLOGY</OPTION>
<OPTION VALUE="103">CHEMISTRY</OPTION>
</SELECT>

And created a php if-statement for it:

if ($courseID =='101')
{
      $CourseName == 'MATHS';
      //code for the insert statement
}

if ($courseID =='102')
{
      $CourseName = 'BIOLOGY';
      //code for the insert statement
}

And it is working fine.
But the same does not work for the update statement.