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 timestamp NOT NULL,
    user_id int NOT NULL,
    level varchar,
    song_id varchar,
    artist_id varchar,
    session_id int,
    location varchar,
    user_agent varchar
);
""")

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,
    year int,
    duration numeric
);
""")

artist_table_create = ("""
CREATE TABLE IF NOT EXISTS artists (
    artist_id varchar PRIMARY KEY,
    name varchar,
    location varchar,
    latitude numeric,
    longitude numeric
);
""")

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 text
);
""")

# 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);

""")

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, 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]