-- Database schema
| runs : run_at [ TEXT ] , max_rowid [ INTEGER ] , reviews_added [ INTEGER ] | podcasts : podcast_id [ TEXT ] primary_key , itunes_id [ INTEGER ] , slug [ TEXT ] , itunes_url [ TEXT ] , title [ TEXT ] | reviews : podcast_id [ TEXT ] , title [ TEXT ] , content [ TEXT ] , rating [ INTEGER ] , author_id [ TEXT ] , created_at [ TEXT ] | categories : podcast_id [ TEXT ] , category [ TEXT ] |
-- -- What is the percentage of the podcast that are categorized in four or more categories?

SELECT COUNT(T1.podcast_id) FROM ( SELECT podcast_id FROM categories GROUP BY podcast_id HAVING COUNT(category) >= 4 ) AS T1;