Populating more than one table and more than one field

Question

I need some suggestions and this forum has always been a great source of good advice.
I have a web form at the following location: http://www.webdevpractice.com/genoptix/CE/register.php
Here's what the web form needs to do:
Send a confirmation email listing seminars the visitor checked on the form.
Create a similar message on a confirmation page.
Populate 2 two tables.
Items 1 and 2 are working fine.
The advice I need is on how to populate two tables in the database.
There are three tables:
ACCOUNTS
account_id
first_name
last_name
medtech_id
job_title
npi
company
city
state
email
phone
contact
ATTENDANCE
attendance_id
account_id
seminar_id
SEMINARS
seminar_id
seminar
speaker_first_name
speaker_last_name
date
The web form contains data that need to go into the ACCOUNTS table and the ATTENDANCE table. The challenge is getting the account_id and seminar_id into the ATTENDANCE table. If all the information was inserted properly, I could write a query that revealed who was taking what seminar.
Inserting data into the ACCOUNTS table is not a problem. I will create another form to insert information into the SEMINARS so that should not be a problem. But inserting the account_id and the seminar_id is what I am wondering about. Also, can more than one record be inserted in a table? If an user checks more that one seminar, each seminar (seminar_id) would need to be inserted in the ATTENDANCE table as separate records along with the account_id. I'm thinking I may have to do this manually. Also, the values for each seminar are their dates and titles. I used these as values to send the confirmations.
I'm just looking for advice at this point. Is this doable?

Answer 1

Bregent,
The table I am wondering about is the ATTENDANCE table. There are two fields in addition to the primary key: account_id and seminar_id. The field I am concern with is the seminar_id which comes from a group of checkboxs on the form. So, one form could create several records. For example, presently there are three seminars that are offered. If the visitor selects all three seminars, that would create three records in the SEMINARS table. So, it might look like this:
attendance_id     account_id     seminar_id
     1                    1                    1
     2                    1                    2
     3                    1                    3
My PHP skills are basic. I've done other forms and use PHP in other ways. But I have never had to populate several rows in one table with an array of checkboxes nor have I be able to find an example of this.
So the advice I am seeking (and perhaps this is premature) is this:
Can one field from a table populate more than one record?
Should I set up checkboxs as a group or individually with a different name?
I am also considering setting up my tables differently so there is a table from each seminar--that may solve my problem.