need help regarding part of a database I am trying to get functioning. User scans a card with a barcode need to log the entry time and reduce a unit value by 1 in a table e.g user has 20 credits when they log in thier time is recorded and 1 credit is deducted from the 20 credits a warning is displayed when the credits are reduced to 1. I am a novice in this , am using ms access, thanks in advance