text: INSERT INTO buy_book
  SELECT NULL, 5, book_id, 2
  FROM buy_book 
        JOIN book USING(book_id)
  WHERE title = "Лирика";
  
  INSERT INTO buy_book
  SELECT NULL, 5, book_id, 1
  FROM buy_book 
       JOIN book USING(book_id)
  WHERE title = "Белая гвардия";
  
  SELECT * 
  FROM buy_book;
  