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 VARCHAR NOT NULL, 
start_time TIMESTAMP NOT NULL, 
user_id VARCHAR NOT NULL, 
level VARCHAR, 
song_id VARCHAR, 
artist_id VARCHAR, 
session_id VARCHAR, 
location VARCHAR, 
user_agent VARCHAR,
PRIMARY KEY (songplay_id),
FOREIGN KEY (user_id) REFERENCES users (user_id),
FOREIGN KEY (artist_id) REFERENCES artists (artist_id), 
FOREIGN KEY (song_id) REFERENCES songs (song_id),
FOREIGN KEY (start_time) REFERENCES time (start_time)
);""")

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

song_table_create = ("""CREATE TABLE IF NOT EXISTS songs (
song_id VARCHAR, 
title VARCHAR, 
artist_id VARCHAR NOT NULL, 
year INTEGER, 
duration FLOAT, 
PRIMARY KEY (song_id),
FOREIGN KEY (artist_id) REFERENCES artists (artist_id)
);""")

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

time_table_create = ("""CREATE TABLE IF NOT EXISTS time (
start_time TIMESTAMP NOT NULL, 
hour INTEGER, 
day INTEGER,
week INTEGER,
month INTEGER,
year INTEGER,
weekday VARCHAR,
PRIMARY KEY (start_time)
);""")

# 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 (%s, %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 NOTHING;""")

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 songs.title = %s AND artists.name = %s AND songs.duration = %s
""")

# QUERY LISTS

create_table_queries = [user_table_create, artist_table_create, song_table_create, time_table_create, songplay_table_create]
drop_table_queries = [songplay_table_drop, user_table_drop, song_table_drop, artist_table_drop, time_table_drop]