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sql_queries.py
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sql_queries.py
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# 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 VARCHAR(100) NOT NULL,
user_id INTEGER NOT NULL,
level VARCHAR (50) NOT NULL,
song_id VARCHAR(100),
artist_id VARCHAR(100),
session_id INTEGER NOT NULL,
location VARCHAR(50),
user_agent VARCHAR(255) NOT NULL
);
""")
user_table_create = ("""
CREATE TABLE IF NOT EXISTS users(
user_id INTEGER PRIMARY KEY,
first_name VARCHAR(50) NOT NULL,
last_name VARCHAR(50) NOT NULL,
gender VARCHAR(1) NOT NULL,
level VARCHAR(5) NOT NULL
);""")
song_table_create = ("""
CREATE TABLE IF NOT EXISTS songs (
song_id VARCHAR(100) PRIMARY KEY,
title VARCHAR(100) NOT NULL,
artist_id VARCHAR(100) NOT NULL,
year INTEGER NOT NULL,
duration NUMERIC NOT NULL
);""")
artist_table_create = ("""
CREATE TABLE IF NOT EXISTS artists(
artist_id VARCHAR(100) PRIMARY KEY,
name VARCHAR(100) NOT NULL,
location VARCHAR(50) NOT NULL,
latitude VARCHAR(50) NOT NULL,
longitude VARCHAR(50) NOT NULL
);
""")
time_table_create = ("""
CREATE TABLE IF NOT EXISTS time(
time_id serial PRIMARY KEY,
start_time VARCHAR(100),
hour INTEGER NOT NULL,
day INTEGER NOT NULL,
week INTEGER NOT NULL,
month INTEGER NOT NULL,
year INTEGER NOT NULL,
weekday INTEGER NOT NULL,
user_id INTEGER 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 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(user_id,start_time, hour, day, week, month, year, weekday)
VALUES (%s,%s,%s,%s,%s,%s,%s,%s)
""")
# FIND SONGS
# The goal is to get the song_id and artist_id which are already in the songs table
# there is not need for a join between songs and artists table
song_select = ("""SELECT song_id,artist_id FROM songs WHERE title=%s AND duration=%s""")
# SELECT A.song_id,B.artist_id FROM (SELECT song_id FROM songs WHERE title='%s' AND duration='%s') AS A ,(SELECT artist_id FROM artists WHERE name='%s') AS B;
# QUERY LISTS
create_table_queries = [user_table_create, song_table_create, artist_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]