sql_queries.py

# DROP TABLES

songplay_table_drop = "DROP TABLE IF EXISTS songplay;"
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 REFERENCES time(start_time), 
user_id varchar NOT NULL REFERENCES users(user_id), 
level varchar, 
song_id varchar REFERENCES songs(song_id), 
artist_id varchar REFERENCES artists(artist_id), 
session_id varchar, 
location varchar, 
user_agent varchar
)
""")

user_table_create = ("""
CREATE TABLE IF NOT EXISTS users (
user_id varchar 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 NOT NULL REFERENCES artists(artist_id),
year integer,
duration numeric
)
""")

artist_table_create = ("""
CREATE TABLE IF NOT EXISTS artists (
artist_id varchar PRIMARY KEY, 
artist_name varchar, 
artist_location varchar, 
artist_latitude varchar NULL, 
artist_longitude varchar NULL)
""")

time_table_create = ("""
CREATE TABLE IF NOT EXISTS time (
start_time timestamp 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)
ON CONFLICT 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 DO NOTHING;
""")

artist_table_insert = ("""
INSERT INTO artists (artist_id, artist_name, artist_location, artist_latitude, artist_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 s.song_id, s.artist_id 
FROM songs s
INNER JOIN artists a ON s.artist_id = a.artist_id
WHERE s.title = %s AND a.artist_name = %s AND s.duration = %s;
""")

# QUERY LISTS

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