Guys, this site contains many samples of database design in form of crow foot's ER diagram. Although some of them are not quite useful for Indonesian companies, but this should provide an insight about the database design should be. Here's the link:
Library of database designs
IMHO, this is not a spoiler (those who likes to search for game hints, know what I mean :)), and it should be assumed as a sample, not for practices or even best practices.