Simple mysql databse lookup & addition script

When we ship orders with a particular courier, we only get a reference number which we email to the customer. In the evening the courier will email us the tracking numbers which correspond to the reference numbers. We then have to email the customers again the next day with their actual tracking numbers which wastes our time. We want a simple script so that: 1. Each day we can easily upload the reference numbers & the corresponding tracking numbers to a mysql database. 2. Customers can goto a simple page on our website where they enter the reference number (that we emailed them) and it gives them their corresponding tracking number. If the tracking number is not yet in the database, it can simply give a message that it takes up to 48 hours to update and to check back later.