Conditional content from 2 tables in PHP/MYSQL

I am developing a site in DWCS4 that has a database with 2 tables: audio and notes.
The tables contain the following fields:
AUDIO
audio_id (ai)
title (varchar)
filename (varchar)
(plus other fields for date, speaker etc)
NOTES
notes_id (ai)
audio_id (int) - foreign key
title (varchar)
file_location (varchar)
(plus other fields for date, author etc)
I have a page which lists audio files which enables a selection to be made that then leads to a page (audio_detail.php) which has full details of the audio and contains a player (see www.wscnf.org/audio.php).
Some of these audio files have associated notes and others do not - those that do contain the reference from audio.audio_id in notes.audio_id - if there are no notes then the foreign key defaults to a value of 0.
I have been asked to amend the audio_detail.php page so that, if there is an associated notes file, a link to that file is shown on the page - what I have in mind is if there are asscoiated notes, a new line appears beneath the player which says "Notes accompanying this audio are available:" followed by a download link. If there are no associated notes then this line does not appear.
Any assistance on how to achieve this would be most welcome - my knowledge of PHP/MYSQL is fairly basic (but growing!)

There are several ways to go about this, but the one that comes to mind is to use an outer join to select columns from both tables. The outer join will return results from the main table AUDIO regardless of if there are matching results in NOTES. You can then test the column values in NOTES. If the row has a NULL value in NOTES.notes_id, then there is no associate note for that row. If there is an notes_id value, then you can use conditional logic to display the NOTE details, link to other pages, etc.

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