Get up to speed on MySQL basics with this step-by-step tutorial on how to create a database, add a table, and input data into the table.

If you plan to do database development with Java and MySQL, the first thing you’ll need to do is configure a database schema. Technically speaking, the first thing to do before you configure a schema ...

Yes. Foreign keys can refer to another column in the same table. The top-level folder might need to be its own parent - I don't know if it'll let you have a NULL there.