I don't care for the "very expensive ERP" option either. I got to work with one for a period of several years and found it tedious and difficult. Let's face it...it didn't want to be customized at all. It was slow and inefficient and completely incapable of ALTERing anything. Every change involved a complete rebuild of the table, so it didn't keep any indexes we created on anything. The foreign keys were maintained by the application and not the database, which helped bloat the application. I'm thankful I don't have to work with it any more.