### Database Schema:
CREATE TABLE Award (
	award_id	INTEGER	NULL	PRIMARY KEY,
	organization	TEXT	NULL,
	year	INTEGER	NULL,
	award_category	TEXT	NULL,
	award	TEXT	NULL,
	series	TEXT	NULL,
	episode_id	TEXT	NULL,
	person_id	TEXT	NULL,
	role	TEXT	NULL,
	result	TEXT	NULL,
	foreign key (episode_id) references Episode (episode_id),
	foreign key (person_id) references Person (person_id)
);

CREATE TABLE Episode (
	episode_id	TEXT	NULL	PRIMARY KEY,
	series	TEXT	NULL,
	season	INTEGER	NULL,
	episode	INTEGER	NULL,
	number_in_series	INTEGER	NULL,
	title	TEXT	NULL,
	summary	TEXT	NULL,
	air_date	DATE	NULL,
	episode_image	TEXT	NULL,
	rating	REAL	NULL,
	votes	INTEGER	NULL
);

CREATE TABLE Credit (
	episode_id	TEXT	NULL	PRIMARY KEY,
	person_id	TEXT	NULL	PRIMARY KEY,
	category	TEXT	NULL,
	role	TEXT	NULL,
	credited	TEXT	NULL,
	foreign key (person_id) references Person (person_id),
	foreign key (episode_id) references Episode (episode_id)
);

CREATE TABLE Keyword (
	episode_id	TEXT	NULL	PRIMARY KEY,
	keyword	TEXT	NULL	PRIMARY KEY,
	foreign key (episode_id) references Episode (episode_id)
);

CREATE TABLE Person (
	person_id	TEXT	NULL	PRIMARY KEY,
	name	TEXT	NULL,
	birthdate	DATE	NULL,
	birth_name	TEXT	NULL,
	birth_place	TEXT	NULL,
	birth_region	TEXT	NULL,
	birth_country	TEXT	NULL,
	height_meters	REAL	NULL,
	nickname	TEXT	NULL
);

CREATE TABLE Vote (
	episode_id	TEXT	NULL,
	stars	INTEGER	NULL,
	votes	INTEGER	NULL,
	percent	REAL	NULL,
	foreign key (episode_id) references Episode (episode_id)
);

### User's Query:
What is the percentage of people who gave the "True North" episode a 1-star rating?

### Extra Knowledge:
the "True North" episode refers to title = 'True North'; 1-star refers to stars = 1; percentage = divide(count(episode_id where stars = 1), count(episode_id)) * 100% where title = 'True North'
SELECT CAST(SUM(CASE WHEN T2.stars = 1 THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.episode_id) FROM Episode AS T1 INNER JOIN Vote AS T2 ON T1.episode_id = T2.episode_id WHERE T1.title = 'True North' AND T1.episode_id = 'tt0629477'