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, 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, last_name varchar, gender varchar, level varchar NOT NULL)""")

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

artist_table_create = ("""CREATE TABLE IF NOT EXISTS artists \
                            (artist_id varchar PRIMARY KEY, name varchar, location varchar, latitude float, longitude float) """)

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

# 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)""")


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""") #the [,values] come from etl.ipynb file

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 songs.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]