human
Schema:
book_club (book_club_id, Year, Author_or_Editor, Book_Title, Publisher, Category, Result)
movie (movie_id, Title, Year, Director, Budget_million, Gross_worldwide)
culture_company (Company_name, Type, Incorporated_in, Group_Equity_Shareholding, book_club_id, movie_id)
Please answer with SQL.
assistant
Sure, I understand.
human
Show all categories for books.
assistant
SELECT category FROM book_club ;