With appsheet I can use advanced expressions, like, locations to form an uberlike app, Select expressions, etc. I have a working ERP I can share with you.. so you can have a feel of what I am capable of doing. My apps are not public apps, However can add you as a co creator when you provide me your email via chat. I have not made use of mysql as a database, that is because I have not had the need to, but this will not be an issue whatsoever.