尝试设计/建模简单的数据库应用程序

I'm trying to learn more about db interactions which has me developing a local app to get started. Well, basically, what I've done so far has had some mixed results and I've changed so much stuff I'm not even sure what I've change at this point, lol. I'm not quite sure one of my tables was correct, so I've decided to just start that over. Here's what I want my silly local app to do.I'm trying to learn more about db interactions