You are now a sqlite data analyst, and you are given a database schema as follows:

    【Schema】
    【DB_ID】 movies_4
【Schema】
# Table: language_role
[
(role_id:INTEGER, Primary Key, Examples: [1, 2]),
(language_role:TEXT, Examples: [Original, Spoken])
]
# Table: country
[
(country_id:INTEGER, Primary Key, Examples: [128, 129, 130]),
(country_iso_code:TEXT, Examples: [AE, AF, AO]),
(country_name:TEXT, Examples: [United Arab Emirates, Afghanistan, Angola])
]
# Table: production_country
[
(movie_id:INTEGER, Examples: [5, 11, 12]),
(country_id:INTEGER, Examples: [214, 131, 152])
]
# Table: department
[
(department_id:INTEGER, Primary Key, Examples: [1, 2, 3]),
(department_name:TEXT, Examples: [Camera, Directing, Production])
]
# Table: movie_keywords
[
(movie_id:INTEGER, Examples: [5, 11, 12]),
(keyword_id:INTEGER, Examples: [612, 613, 616])
]
# Table: movie_company
[
(movie_id:INTEGER, Examples: [5, 11, 12]),
(company_id:INTEGER, Examples: [14, 59, 1])
]
# Table: language
[
(language_id:INTEGER, Primary Key, Examples: [24574, 24575, 24576]),
(language_code:TEXT, Examples: [en, sv, de]),
(language_name:TEXT, Examples: [English, svenska, Deutsch])
]
# Table: movie_cast
[
(movie_id:INTEGER, Examples: [285, 559, 767]),
(person_id:INTEGER, Examples: [85, 114, 116]),
(character_name:TEXT, Examples: [Captain Jack Sparrow, Will Turner, Elizabeth Swann]),
(gender_id:INTEGER, Examples: [2, 1, 0]),
(cast_order:INTEGER, Examples: [0, 1, 2])
]
# Table: movie_crew
[
(movie_id:INTEGER, Examples: [285, 559, 767]),
(person_id:INTEGER, Examples: [120, 1704, 770]),
(department_id:INTEGER, Examples: [1, 2, 3]),
(job:TEXT, Examples: [Director of Photography])
]
# Table: person
[
(person_id:INTEGER, Primary Key, Examples: [1, 2, 3]),
(person_name:TEXT, Examples: [George Lucas, Mark Hamill, Harrison Ford])
]
# Table: keyword
[
(keyword_id:INTEGER, Primary Key, Examples: [30, 65, 74]),
(keyword_name:TEXT, Examples: [individual, holiday, germany])
]
# Table: production_company
[
(company_id:INTEGER, Primary Key, Examples: [1, 2, 3]),
(company_name:TEXT, Examples: [Lucasfilm])
]
# Table: genre
[
(genre_id:INTEGER, Primary Key, Examples: [12, 14, 16]),
(genre_name:TEXT, Examples: [Adventure, Fantasy, Animation])
]
# Table: gender
[
(gender_id:INTEGER, Primary Key, Examples: [0, 1, 2]),
(gender:TEXT, Examples: [Unspecified, Female, Male])
]
# Table: movie_languages
[
(movie_id:INTEGER, Examples: [5, 11, 12]),
(language_id:INTEGER, Examples: [24574, 24575, 24576]),
(language_role_id:INTEGER, Examples: [2, 1])
]
# Table: movie
[
(movie_id:INTEGER, Primary Key, Examples: [5, 11, 12]),
(title:TEXT, Examples: [Four Rooms, Star Wars, Finding Nemo]),
(budget:INTEGER, Examples: [4000000, 11000000, 94000000]),
(homepage:TEXT),
(overview:TEXT),
(popularity:REAL, Examples: [22.87623, 126.393695, 85.688789]),
(release_date:DATE, Examples: [1995-12-09]),
(revenue:INTEGER, Examples: [4300000, 775398007, 940335536]),
(runtime:INTEGER, Examples: [98, 121, 100]),
(movie_status:TEXT, Examples: [Released, Rumored, Post Production]),
(tagline:TEXT),
(vote_average:REAL, Examples: [6.5, 8.1, 7.6]),
(vote_count:INTEGER, Examples: [530, 6624, 6122])
]
# Table: movie_genres
[
(movie_id:INTEGER, Examples: [5, 11, 12]),
(genre_id:INTEGER, Examples: [35, 80, 12])
]
【Foreign keys】
production_country.country_id=country.country_id
production_country.movie_id=movie.movie_id
movie_keywords.keyword_id=keyword.keyword_id
movie_keywords.movie_id=movie.movie_id
movie_company.company_id=production_company.company_id
movie_company.movie_id=movie.movie_id
movie_cast.gender_id=gender.gender_id
movie_cast.movie_id=movie.movie_id
movie_cast.person_id=person.person_id
movie_crew.department_id=department.department_id
movie_crew.movie_id=movie.movie_id
movie_crew.person_id=person.person_id
movie_languages.language_id=language.language_id
movie_languages.movie_id=movie.movie_id
movie_languages.language_role_id=language_role.role_id
movie_genres.genre_id=genre.genre_id
movie_genres.movie_id=movie.movie_id

    【Question】
    How many movies did Harrison Ford appear in total?

    【Evidence】
    

    Please read and understand the database schema carefully, and generate an executable SQL based on the user's question and evidence. 

SQL: SELECT COUNT(T2.movie_id) FROM person AS T1 INNER JOIN movie_cast AS T2 ON T1.person_id = T2.person_id WHERE T1.person_name = 'Harrison Ford'