Of the arts-books and arts-design categories, which one has more podcasts and what is the numerical difference between them?
arts-books' and 'arts-design' are category; numerical difference = Subtract(Count(podcast_id(category = 'arts-books')), Count(podcast_id(category = 'arts-design'))); one has much more podcast refers to Max(Count(podcast_id))
SELECT ( SELECT category FROM categories WHERE category = 'arts-books' OR category = 'arts-design' GROUP BY category ORDER BY COUNT(podcast_id) DESC LIMIT 1 ) "has more podcasts" , ( SELECT SUM(CASE WHEN category = 'arts-books' THEN 1 ELSE 0 END) - SUM(CASE WHEN category = 'arts-design' THEN 1 ELSE 0 END) FROM categories ) "differenct BETWEEN arts-books and arts-design"