How to choose the value null

Hi all

I use oracle 9i.
I have a Book table and there column: book_id, book_name, book_rating etc.
Books are rated on a scale of 1 to 10, and the database is associated with a book.
There are books that are not yet rated and these recordings has a null value in this column to book_rating.

I want to write a cursor that can browse this book_rating.
I started with a loop for iteration of 1.10 (because I in 1.10 loop)
and in this loop, I declare my cursor and where clause wrote:

where book_rating = i;

This condition will take care of the sides with a value of 1 to 10, but this custom work for null values.

How can I write this code so that I can understand the books that are not rated so far (null in the column book_rating)?

Thank you

Will be something like this help

FOR I IN 0..10
LOOP
     SELECT ..
       FROM ..
      WHERE NVL(BOOK_RATE,0) = i;
END LOOP;

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