Record Sets - Selecting All Results

im a passing 3 fields from a form to use a search criteria against an access database table, i have set the fields a numeric values, what should i use to allow all records to be shown for a invidual value rather than a selected value.

Ie the form would pass

Location_id as 22

so the result page would see Request.form("Location_id")

sql would then see

where location_id = var1

var = 22

but i want to get the sql to say

where location_id >=0

what do i need to do