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 UNIQUE NOT NULL PRIMARY KEY,
    first_name VARCHAR,
    last_name VARCHAR,
    gender VARCHAR,
    level VARCHAR
  );
""")

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

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

time_table_create = ("""
  CREATE TABLE IF NOT EXISTS time (
    start_time TIMESTAMP UNIQUE NOT NULL 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(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
    s.song_id,
    a.artist_id
  FROM songs AS s
    LEFT JOIN artists AS a ON s.artist_id = a.artist_id
  WHERE s.title = %s
    AND a.name = %s
    AND s.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]