### 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 title of the episode that has the highest number of crews in the Art Department?

### Extra Knowledge:
the highest number of crews refers to max(count(person_id)); in the Art Department refers to category = 'Art Department'
SELECT T2.title FROM Credit AS T1 INNER JOIN Episode AS T2 ON T1.episode_id = T2.episode_id WHERE T1.category = 'Art Department' GROUP BY T2.episode_id ORDER BY COUNT(T1.category) DESC LIMIT 1