Sparkify 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 PRIMARY KEY, 
        start_time TIME NOT NULL, 
        user_id VARCHAR NOT NULL, 
        level VARCHAR NOT NULL, 
        song_id VARCHAR, 
        artist_id VARCHAR, 
        session_id VARCHAR, 
        location VARCHAR, 
        user_agent VARCHAR
    );
""")

user_table_create = ("""
    CREATE TABLE IF NOT EXISTS users
    (
        user_id VARCHAR PRIMARY KEY, 
        first_name VARCHAR NOT NULL, 
        last_name VARCHAR NOT NULL, 
        gender CHAR, 
        level VARCHAR NOT NULL
    );
""")

song_table_create = ("""
    CREATE TABLE IF NOT EXISTS songs
    (
        song_id VARCHAR PRIMARY KEY, 
        title VARCHAR NOT NULL, 
        artist_id VARCHAR NOT NULL, 
        year INT, 
        duration DECIMAL NOT NULL
    );
""")

artist_table_create = ("""
    CREATE TABLE IF NOT EXISTS artists
    (
        artist_id VARCHAR PRIMARY KEY, 
        name VARCHAR NOT NULL, 
        location VARCHAR, 
        lattitude DECIMAL, 
        longitude DECIMAL
    );
""")

time_table_create = ("""
    CREATE TABLE IF NOT EXISTS time
    (
        start_time TIME PRIMARY KEY, 
        hour INT NOT NULL, 
        day INT NOT NULL, 
        week INT NOT NULL, 
        month INT NOT NULL, 
        year INT NOT NULL, 
        weekday INT NOT NULL
    );
""")

# INSERT RECORDS

songplay_table_insert = ("""
    INSERT INTO songplays (songplay_id, start_time, user_id, level, song_id, artist_id, session_id, location, user_agent)
        VALUES (%s, %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
            first_name = EXCLUDED.first_name,
            last_name = EXCLUDED.gender,
            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, lattitude, longitude)
        VALUES (%s, %s, %s, %s, %s)
        ON CONFLICT (artist_id)
        DO UPDATE SET
            name = EXCLUDED.name,
            location = EXCLUDED.location,
            lattitude = EXCLUDED.lattitude,
            longitude = EXCLUDED.longitude;
""")


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 songs.song_id, songs.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                                    
    LIMIT 1;                                                       
""")

# 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]