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sql_queries.py
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sql_queries.py
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import configparser
# CONFIG
config = configparser.ConfigParser()
config.read('dwh.cfg')
# DROP TABLES
staging_events_table_drop = "DROP TABLE IF EXISTS staging_events"
staging_songs_table_drop = "DROP TABLE IF EXISTS staging_songs"
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
staging_events_table_create = ("""
CREATE TABLE IF NOT EXISTS staging_events (
event_id BIGINT IDENTITY(0,1),
artist VARCHAR,
auth VARCHAR,
firstName VARCHAR,
gender VARCHAR,
itemInSession VARCHAR,
lastName VARCHAR,
length VARCHAR,
level VARCHAR,
location VARCHAR,
method VARCHAR,
page VARCHAR,
registration VARCHAR,
sessionId INTEGER SORTKEY DISTKEY,
song VARCHAR,
status INTEGER,
ts BIGINT,
userAgent VARCHAR,
userId INTEGER
);
""")
staging_songs_table_create = ("""
CREATE TABLE IF NOT EXISTS staging_songs (
num_songs INTEGER,
artist_id VARCHAR SORTKEY DISTKEY,
artist_latitude VARCHAR,
artist_longitude VARCHAR,
artist_location VARCHAR(500),
artist_name VARCHAR(500),
song_id VARCHAR,
title VARCHAR(500),
duration DECIMAL(9),
year INTEGER
);
""")
songplay_table_create = ("""
CREATE TABLE IF NOT EXISTS songplays (
songplay_id INTEGER IDENTITY(0,1) NOT NULL SORTKEY,
start_time TIMESTAMP NOT NULL,
user_id VARCHAR(50) NOT NULL DISTKEY,
level VARCHAR(10) NOT NULL,
song_id VARCHAR(40) NOT NULL,
artist_id VARCHAR(50) NOT NULL,
session_id VARCHAR(50) NOT NULL,
location VARCHAR(100) NULL,
user_agent VARCHAR(255) NULL
);
""")
user_table_create = ("""
CREATE TABLE IF NOT EXISTS users (
user_id INTEGER NOT NULL SORTKEY,
first_name VARCHAR(50) NULL,
last_name VARCHAR(80) NULL,
gender VARCHAR(10) NULL,
level VARCHAR(10) NULL
) diststyle all;
""")
song_table_create = ("""
CREATE TABLE IF NOT EXISTS songs (
song_id VARCHAR(50) NOT NULL SORTKEY,
title VARCHAR(500) NOT NULL,
artist_id VARCHAR(50) NOT NULL,
year INTEGER NOT NULL,
duration DECIMAL(9) NOT NULL
);
""")
artist_table_create = ("""
CREATE TABLE IF NOT EXISTS artists (
artist_id VARCHAR(50) NOT NULL SORTKEY,
name VARCHAR(500) NULL,
location VARCHAR(500) NULL,
latitude DECIMAL(9) NULL,
longitude DECIMAL(9) NULL
) diststyle all;
""")
time_table_create = ("""
CREATE TABLE IF NOT EXISTS time (
start_time TIMESTAMP NOT NULL SORTKEY,
hour SMALLINT NULL,
day SMALLINT NULL,
week SMALLINT NULL,
month SMALLINT NULL,
year SMALLINT NULL,
weekday SMALLINT NULL
) diststyle all;
""")
# STAGING TABLES
staging_events_copy = ("""
COPY staging_events FROM {}
credentials 'aws_iam_role={}'
format as json {}
STATUPDATE ON
region 'us-west-2';
""").format(config.get('S3', 'LOG_DATA'), config.get('IAM_ROLE', 'ARN'), config.get('S3', 'LOG_JSONPATH'))
staging_songs_copy = ("""
COPY staging_songs FROM {}
credentials 'aws_iam_role={}'
format as json 'auto'
ACCEPTINVCHARS AS '^'
STATUPDATE ON
region 'us-west-2';
""").format(config.get('S3', 'SONG_DATA'), config.get('IAM_ROLE', 'ARN'))
# FINAL TABLES
songplay_table_insert = ("""
INSERT INTO songplays (
start_time,
user_id,
level,
song_id,
artist_id,
session_id,
location,
user_agent)
SELECT DISTINCT TIMESTAMP 'epoch' + se.ts/1000 \
* INTERVAL '1 second' AS start_time,
se.userId AS user_id,
se.level AS level,
ss.song_id AS song_id,
ss.artist_id AS artist_id,
se.sessionId AS session_id,
se.location AS location,
se.userAgent AS user_agent
FROM songplays AS se
JOIN staging_songs AS ss ON (se.song = ss.title AND se.artist = ss.artist_name)
WHERE se.page = 'NextSong';
""")
user_table_insert = ("""
INSERT INTO users (
user_id,
first_name,
last_name,
gender,
level)
SELECT DISTINCT se.userId AS user_id,
se.firstName AS first_name,
se.lastName AS last_name,
se.gender AS gender,
se.level AS level
FROM songplays AS se
WHERE se.page = 'NextSong';
""")
song_table_insert = ("""
INSERT INTO songs (
song_id,
title,
artist_id,
year,
duration)
SELECT DISTINCT ss.song_id AS song_id,
ss.title AS title,
ss.artist_id AS artist_id,
ss.year AS year,
ss.duration AS duration
FROM staging_songs AS ss;
""")
artist_table_insert = ("""
INSERT INTO artists (
artist_id,
name,
location,
latitude,
longitude)
SELECT DISTINCT ss.artist_id AS artist_id,
ss.artist_name AS name,
ss.artist_location AS location,
ss.artist_latitude AS latitude,
ss.artist_longitude AS longitude
FROM staging_songs AS ss;
""")
time_table_insert = ("""
INSERT INTO time (
start_time,
hour,
day,
week,
month,
year,
weekday)
SELECT DISTINCT TIMESTAMP 'epoch' + se.ts/1000 \
* INTERVAL '1 second' AS start_time,
EXTRACT(hour FROM start_time) AS hour,
EXTRACT(day FROM start_time) AS day,
EXTRACT(week FROM start_time) AS week,
EXTRACT(month FROM start_time) AS month,
EXTRACT(year FROM start_time) AS year,
EXTRACT(week FROM start_time) AS weekday
FROM songplays AS se
WHERE se.page = 'NextSong';
""")
# QUERY LISTS
create_table_queries = [staging_events_table_create, staging_songs_table_create, songplay_table_create,
user_table_create, song_table_create, artist_table_create, time_table_create]
drop_table_queries = [staging_events_table_drop, staging_songs_table_drop, songplay_table_drop, user_table_drop,
song_table_drop, artist_table_drop, time_table_drop]
copy_table_queries = [staging_events_copy, staging_songs_copy]
insert_table_queries = [songplay_table_insert, user_table_insert, song_table_insert, artist_table_insert,
time_table_insert]