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 bigint 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 PRIMARY KEY, first_name varchar NOT NULL, last_name varchar NOT NULL, \
gender varchar, level varchar);
""")

song_table_create = ("""CREATE TABLE IF NOT EXISTS songs \
(song_id varchar PRIMARY KEY, title varchar NOT NULL, artist_id varchar NOT NULL, \
year int NOT NULL, duration numeric NOT NULL);
""")

artist_table_create = ("""CREATE TABLE IF NOT EXISTS artists \
(artist_id varchar PRIMARY KEY, name varchar NOT NULL, location varchar, \
lattitude numeric, longitude numeric);
""")

time_table_create = ("""CREATE TABLE IF NOT EXISTS time \
(start_time bigint PRIMARY KEY, hour int NOT NULL, day int NOT NULL, \
week int NOT NULL, month int NOT NULL, year int NOT NULL, weekday int NOT NULL);
""")

# 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 (song_id)\
DO NOTHING;""")

artist_table_insert = ("""INSERT INTO artists (artist_id, name, location, lattitude, 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 = [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]