sql_queries.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-


# 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 INTEGER NOT NULL,
    level VARCHAR,
    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 INTEGER 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 INTEGER,
    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 BIGINT PRIMARY KEY,
    hour INTEGER,
    day INTEGER,
    week INTEGER,
    month INTEGER,
    year INTEGER,
    weekday INTEGER
    );    
""")

# 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 DO NOTHING
""")

artist_table_insert = ("""INSERT INTO artists (artist_id, name, location, latitude, 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, artists.artist_id FROM songs JOIN artists ON songs.artist_id = artists.artist_id 
    WHERE title = %s AND artists.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]