>Multivalue - Select All

[joshuaguilty]

I use a varchar for the a field datatype. The field is a multi-value, therefore user could check whatever they want. Of cource they could check the 'Select All'. My question is how do I know what the value to be returned when user chooses 'Select All'. The reason behind being the maximum of varchar is 8000 characters. If the 'Select All' is selected I could select all without 'where' restriction.
Thanks.