I remember a couple of decades ago a business user entering many hundreds of monthly company car mileage records into an oracle database. Except instead of keying in a new one each time, he would enter it, then query it, change the reg# and the mileage value, then commit it and repeat. He was very disappointed after a day or two of long tedious effort to find he had keyed in precisely one record. We (IT team) trained the business team who then decided they could train the new starter without using the training materials we had provided them with. Oh, how he laughed!