Your final task this week, is simply to chart out what kind of SQL queries your tagging system might need to run. From there, create a DAO interface which declares the methods that will call those queries. You won't need to implement them yet, that's a task for the next dive.

You will need, at minimum:

• A method to add a tag to a book, given the tag name and a reference to a book (either a Book reference variable or just an ISBN-13)
• A method to remove a tag from a book, given the tag name and a reference to a book (either a Book reference variable or just an ISBN-13)
• A method to retrieve all tags that have been added to a given book
• A method to retrieve all books that have a given tag. Hint: This will require either a SQL JOIN statement or a nested query.