Hi Misty!
i'm not sure if you still need answer to your last query but just the same, here is my suggestion:
if you want to know all the customers that have web hosting record, try this:
select C.*
from CUSTOMERS as C
inner join WEBHOSTING as WH on C.webhostingid = WH.webhostingid
if you want to know all the customers that have no web hosting record, try this:
select C.*
from CUSTOMERS as C
left outer join WEBHOSTING as WH on C.webhostingid = WH.webhostingid
where WH.webhostingid is null
Hope this helps