You recognize good night, the younger brother is a Java small white design database project to do recently is I bumped into a table don't know how to design task, please and give some advice! So I design table is a table file table clamp table can contain inside a folder with files and folders table, but the folder table can belong to the individual can also belong to the system such as folder (it could be a company may also be own folder) how do want to ask next table design? Folder table and file table