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 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 NOT NULL PRIMARY KEY,
    first_name VARCHAR NOT NULL,
    last_name VARCHAR NOT NULL,
    gender VARCHAR,
    level VARCHAR NOT NULL
    )
""")

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 FLOAT NOT NULL
    )
""")

artist_table_create = (""" 
    CREATE TABLE IF NOT EXISTS artists
    (
    artist_id VARCHAR PRIMARY KEY,
    name VARCHAR NOT NULL,
    location VARCHAR,
    latitude FLOAT,
    longitude FLOAT
    )
""")

time_table_create = (""" 
    CREATE TABLE IF NOT EXISTS time
    (
    start_time BIGINT NOT NULL 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 DO NOTHING
""")

artist_table_insert = ("""
    INSERT INTO artists (artist_id, name, location, latitude, 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 songid, s.artist_id artistid
    from songs s inner join artists a on s.artist_id = a.artist_id
    where s.title = %s and a.name = %s and s.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]