I worked for one company where the ERP DB was 'owned' by a supplier. They demanded shit loads for changes to the DB that our company was normally happy to pay. I realised that most of the changes in the pipeline where just to improve reporting and dug around and found I could write a few stored procedures that would do a few tens of thousand pounds worth of changes. It took me a few hours to learn how to write them and another hour or so to get them to do what I wanted. The suppliers response was to try and re-write the DB to stop me working out how to do this sort of thing and they really caused themselves a few problems keeping ahead of me as they seemed incapable of realising some of the side effects! They even offered me a very good package to go work for them in the smoke but I hate commuting and I was having a lot of fun doing what I was doing!