sql_queries.py

# DROP TABLES

songplay_table_drop = (
    """
    DROP
        TABLE IF EXISTS songplays;
    """
)

user_table_drop = (
    """
    DROP
        TABLE IF EXISTS users;
    """
)

song_table_drop = (
    """
    DROP
        TABLE IF EXISTS songs;
    """
)

artist_table_drop = (
    """
    DROP
        TABLE IF EXISTS artists;
    """
)

time_table_drop = (
    """
    DROP
        TABLE IF EXISTS time;
    """
)


# CREATE TABLES

songplay_table_create = (
    """
    CREATE TABLE IF NOT EXISTS songplays
    (
        songplay_id serial,
        start_time timestamp NOT NULL,
        user_id int NOT NULL,
        level varchar,
        song_id varchar,
        artist_id varchar,
        session__id int,
        location varchar,
        user_agent varchar,
        CONSTRAINT songplay_pk PRIMARY KEY (songplay_id)
    )
    """
)

user_table_create = (
    """
    CREATE TABLE IF NOT EXISTS users
    (
        user_id int,
        first_name varchar,
        last_name varchar,
        gender varchar,
        level varchar,
        CONSTRAINT users_pk PRIMARY KEY (user_id)
    )
    """
)

song_table_create = (
    """
    CREATE TABLE IF NOT EXISTS songs
    (
        song_id varchar,
        title varchar NOT NULL,
        artist_id varchar NOT NULL,
        year int,
        duration double precision NOT NULL,
        CONSTRAINT songs_pk PRIMARY KEY (song_id)
    )
    """
)

artist_table_create = (
    """
    CREATE TABLE IF NOT EXISTS artists
    (
        artist_id varchar,
        name varchar NOT NULL,
        location varchar,
        latitude double precision,
        longitude double precision,
        CONSTRAINT artists_pk PRIMARY KEY (artist_id)
    )
    """
)

time_table_create = (
    """
    CREATE TABLE IF NOT EXISTS time
    (
        start_time timestamp,
        hour int,
        day int,
        week int,
        month int,
        year int,
        weekday int,
        CONSTRAINT time_pk PRIMARY KEY(start_time)
    )
    """
)

# INSERT RECORDS

songplay_table_insert = (
    """
    INSERT INTO songplays
    (
        start_time,
        user_id,
        level,
        song_id,
        artist_id,
        session__id,
        location,
        user_agent
    )
    VALUES
    (%s, %s, %s, %s, %s, %s, %s, %s) ON CONFLICT (songplay_id) DO NOTHING;
    """
)

user_table_insert = (
    """
    INSERT INTO users
    (
        user_id,
        first_name,
        last_name,
        gender,
        level
    )
    VALUES
    (%s, %s, %s, %s, %s) ON CONFLICT (user_id) DO UPDATE SET
    level = EXCLUDED.level;
    """
)

song_table_insert = (
    """
    INSERT INTO songs
    (
        song_id,
        title,
        artist_id,
        year,
        duration
    )
    VALUES
    (%s, %s, %s, %s, %s) ON CONFLICT (song_id) DO NOTHING;
    """
)

artist_table_insert = (
    """
    INSERT INTO artists
    (
        artist_id,
        name,
        location,
        latitude,
        longitude
    )
    VALUES
    (%s, %s, %s, %s, %s) ON CONFLICT (artist_id) DO NOTHING
    """
)

time_table_insert = (
    """
    INSERT INTO time
    (
        start_time,
        hour,
        day,
        week,
        month,
        year,
        weekday
    )
    VALUES
    (%s, %s, %s, %s, %s, %s, %s) ON CONFLICT (start_time) DO NOTHING
    """
)

# FIND SONGS

song_select = (
    """
    SELECT
        song_id,
        artists.artist_id
        FROM
        songs
        JOIN artists ON songs.artist_id = artists.artist_id
        WHERE
        (
            songs.title = %s
            AND artists.name = %s
            AND songs.duration = %s
        )
    """
)


# QUERY LISTS

create_table_queries = [songplay_table_create, user_table_create,
                        song_table_create, artist_table_create,
                        time_table_create]
drop_table_queries = [songplay_table_drop, user_table_drop, song_table_drop,
                      artist_table_drop, time_table_drop]