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 BIGINT NOT NULL,
    user_id INT NOT NULL, 
    level VARCHAR, 
    song_id VARCHAR, 
    artist_id VARCHAR, 
    session_id INT, 
    location VARCHAR, 
    user_agent VARCHAR,
    UNIQUE (start_time, user_id, song_id, artist_id)
);
""")

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

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

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

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

# 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 (start_time, user_id, song_id, artist_id) DO UPDATE
SET start_time = %s, 
    user_id = %s,
    level = %s, 
    song_id = %s, 
    artist_id = %s, 
    session_id = %s, 
    location = %s, 
    user_agent = %s;
""")

user_table_insert = ("""
INSERT INTO users(user_id, first_name,last_name, gender,level) 
        VALUES(%s,%s,%s,%s,%s)
ON CONFLICT DO NOTHING;
""")

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

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

# FIND SONGS

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