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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 songplays
(
songplay_id SERIAL UNIQUE,
start_time TIME,
user_id INTEGER,
level TEXT,
song_id TEXT,
artist_id TEXT,
session_id INTEGER,
location TEXT,
user_agent TEXT
)
"""
user_table_create = """
CREATE TABLE users
(
user_id INTEGER PRIMARY KEY,
first_name TEXT,
last_name TEXT,
gender TEXT,
level TEXT
)
"""
song_table_create = """
CREATE TABLE songs
(
song_id TEXT PRIMARY KEY,
title TEXT,
artist_id TEXT,
year INTEGER,
duration FLOAT
)
"""
artist_table_create = """
CREATE TABLE artists
(
artist_id TEXT PRIMARY KEY,
name TEXT,
location TEXT,
latitude FLOAT,
longitude FLOAT
)
"""
time_table_create = """
CREATE TABLE time
(
start_time TIME PRIMARY KEY,
hour INTEGER,
day INTEGER,
week INTEGER,
month INTEGER,
year INTEGER,
weekday INTEGER
)
"""
# 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,
(
SELECT song_id
FROM songs
WHERE LOWER(TRIM(title)) = LOWER(TRIM(%s))
),
(
SELECT artist_id
FROM artists
WHERE LOWER(TRIM(name)) = LOWER(TRIM(%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 (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 s.song_id, a.artist_id
FROM songs s
JOIN artist a
ON a.artist_id = s.artist_id AND LOWER(TRIM(name)) = LOWER(TRIM(%s))
WHERE LOWER(TRIM(title)) = LOWER(TRIM(%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
]