如何使MS Access对焦点丢失事件运行查询并相应地执行操作

I am creating a small Access DB for our Data Entry guys. Our main DB is mysql but due to ease of use we are creating an Access DB to make it easier for them to enter the Data. I have done most of it but am stuck with this problem (which I know how to solve in mysql+php) Please pardon my ignorance, but I have just started using MS Access.I am creating a small Access DB for our Data En