I don't think I ever said Quickbooks was created with Access. I believe I stated it used SQL, but if I am wrong about that I stand corrected.
Mr SmallPierre, I salute your experience and training. I however was , like you trying to help a fellow tradesman on his way along a path to a solution, but unlike you, I didn't try to lead him to the one that requires 5 yrs of post secondary education along with ten years or whatever it was working for Oracle or the like.
I am not a Filemaker Salesman either, but I do have years of use of it and find it to be a very full featured database system regardless of your dismissal of it.
As to the statements of how well it works with web or on Ipads, well let me help you with that. Here is an introductory video on that very subject. You should watch before you make statements on how functional the product is. I think you have no idea. By the way, it is very easy to add tables, adjust the schema on the fly, add fields, reports, summary's, produce layouts, bring in data from other tables - inside and outside joins , run in data from tables related thru thirty other ones if you need to. Look for yourself http://www.filemaker.com/products/overview.html?video=fmpl-overview