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 TIMESTAMP NOT NULL, 
user_id VARCHAR 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 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,
year INT,
duration FLOAT
)
""")

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 TIME PRIMARY KEY,
hour FLOAT,
day VARCHAR,
week VARCHAR,
month VARCHAR,
year INT,
weekday VARCHAR
)
""")

# 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, 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]