### Database Schema:
CREATE TABLE podcasts (
	podcast_id	TEXT	NULL	PRIMARY KEY,
	itunes_id	INTEGER	NOT NULL,
	slug	TEXT	NOT NULL,
	itunes_url	TEXT	NOT NULL,
	title	TEXT	NOT NULL
);

CREATE TABLE reviews (
	podcast_id	TEXT	NOT NULL,
	title	TEXT	NOT NULL,
	content	TEXT	NOT NULL,
	rating	INTEGER	NOT NULL,
	author_id	TEXT	NOT NULL,
	created_at	TEXT	NOT NULL,
	foreign key (podcast_id) references podcasts (podcast_id)
);

CREATE TABLE runs (
	run_at	TEXT	NOT NULL,
	max_rowid	INTEGER	NOT NULL,
	reviews_added	INTEGER	NOT NULL
);

CREATE TABLE categories (
	podcast_id	TEXT	NOT NULL	PRIMARY KEY,
	category	TEXT	NOT NULL	PRIMARY KEY,
	foreign key (podcast_id) references podcasts (podcast_id)
);

### User's Query:
What is the percentage of the podcast that are categorized in four or more categories?

### Extra Knowledge:
categorized in 4 or more refers to Count(category) > 4; percentage = Divide(Count(podcast_id(count(category) > 4)), Count(podcast_id)) * 100
SELECT COUNT(T1.podcast_id) FROM ( SELECT podcast_id FROM categories GROUP BY podcast_id HAVING COUNT(category) >= 4 ) AS T1