Create a customized Customer Database with four customized reports. The db is for a lodging company and will need room pricing, ability to generate invoices, etc. Also, there needs to be a referral system in which discounts (credits) are recorded for clients that referr other clients. This needs to have error checking so that multiple referrals for the same client can not be recorded. The reports will include: monthly statement of sales, mailing address list of all clients, sales by...