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 artist"
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,
    user_id INT,
    level VARCHAR,
    song_id VARCHAR,
    artist_id VARCHAR,
    session_id INT,
    location VARCHAR,
    user_agent TEXT
)
""")

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 VARCHAR,
    duration FLOAT
)
""")

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

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 VARCHAR
)
""")

# 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 (DEFAULT, %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 UPDATE SET location = EXCLUDED.location, latitude = EXCLUDED.latitude, 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 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]