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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')
#Staging Tables
staging_events_table_drop = "DROP TABLE IF EXISTS staging_events"
staging_songs_table_drop = "DROP TABLE IF EXISTS staging_songs"
#Main Database
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_table"
# CREATE TABLES
## DIST AND SORT KEYS ARE GIVEN TO OPTMIZIE THE QUERIES
staging_events_table_create= (""" CREATE TABLE staging_events(
eventId BIGINT IDENTITY(0,1) NOT NULL distkey,
artist VARCHAR,
auth VARCHAR,
firstName VARCHAR,
gender VARCHAR,
itemInsession SMALLINT,
lastName VARCHAR,
length FLOAT,
level VARCHAR,
location VARCHAR,
method VARCHAR,
page VARCHAR,
registration VARCHAR,
sessionId INTEGER,
song VARCHAR,
status INTEGER,
ts BIGINT,
userAgent VARCHAR,
userId INTEGER);
""")
staging_songs_table_create = (""" CREATE TABLE staging_songs(
num_songs INTEGER,
artist_id VARCHAR NOT NULL,
artist_latitude FLOAT,
artist_longitude FLOAT,
artist_location VARCHAR,
artist_name VARCHAR,
song_id VARCHAR NOT NULL distkey,
title VARCHAR,
duration FLOAT,
year INTEGER sortkey);
""")
songplay_table_create = (""" CREATE TABLE songplays(
songplay_id INTEGER IDENTITY(0,1) NOT NULL distkey sortkey,
start_time TIMESTAMP,
user_id INTEGER NOT NULL,
level VARCHAR,
song_id VARCHAR,
artist_id VARCHAR,
session_id INTEGER NOT NULL,
location VARCHAR,
user_agent VARCHAR
);
""")
user_table_create = (""" CREATE TABLE users(
user_id INTEGER NOT NULL sortkey,
first_name VARCHAR NOT NULL,
last_name VARCHAR NOT NULL,
gender VARCHAR,
level VARCHAR NOT NULL
);
""")
song_table_create = (""" CREATE TABLE songs(
song_id VARCHAR NOT NULL sortkey,
title VARCHAR NOT NULL,
artist_id VARCHAR NOT NULL,
year INTEGER,
duration FLOAT(8)
);
""")
artist_table_create = (""" CREATE TABLE artists(
artist_id VARCHAR NOT NULL sortkey,
name VARCHAR NOT NULL,
location VARCHAR,
latitude FLOAT(8),
longitude FLOAT(8)
);
""")
time_table_create = (""" CREATE TABLE time_table(
start_time TIMESTAMP NOT NULL sortkey,
hour INTEGER,
day INTEGER,
week INTEGER,
month INTEGER,
year INTEGER,
weekday INTEGER
);
""")
# STAGING TABLES
staging_events_copy = (""" COPY staging_events
FROM {}
CREDENTIALS 'aws_iam_role={}'
REGION 'us-west-2'
JSON AS {} ;
""").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={}'
REGION 'us-west-2'
JSON AS 'auto' ;
""").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 timestamp 'epoch' + e.ts/1000 * interval '1 second' AS start_time,
e.userId AS user_id,
e.level AS level,
s.song_id AS song_id,
s.artist_id AS artist_id,
e.sessionId AS session_id,
e.location AS location,
e.userAgent AS user_agent
FROM staging_events e
LEFT JOIN staging_songs s
ON e.song = s.title AND
e.artist = s.artist_name AND
e.length = s.duration
WHERE e.page='NextSong' ;
""")
##UNIQUE USER ## latest level
user_table_insert = (""" INSERT INTO users(user_id, first_name, last_name, gender, level)
SELECT DISTINCT s.userId AS user_id,
s.firstName AS first_name,
s.lastName AS last_name,
s.gender AS gender,
s.level AS level
FROM staging_events s
WHERE s.userId IS NOT NULL AND s.ts =(SELECT max(ts) from staging_events e where e.userId = s.userId
GROUP BY e.userId
ORDER BY e.userId) ;
""")
## UNIQUE SONG
song_table_insert = ("""INSERT INTO songs(song_id, title, artist_id, year, duration)
SELECT DISTINCT song_id AS song_id,
title AS title,
artist_id AS artist_id,
year AS year,
duration AS duration
FROM staging_songs
WHERE song_id IS NOT NULL;
""")
## UNIQUE ARTIST ## There are duplications of artist names for single_id in staging data ( which is sorted by year),
#so Selecting last record of name, location, latitude & longitude)
artist_table_insert = ("""INSERT INTO artists(artist_id, name, location, latitude, longitude)
SELECT DISTINCT s.artist_id AS artist_id,
s.artist_name AS name,
s.artist_location AS location,
s.artist_latitude AS latitude,
s.artist_longitude AS longitude
FROM staging_songs s
WHERE s.artist_id IS NOT NULL and s.year=(SELECT
max(year) AS yr
FROM staging_songs s2 where s2.artist_id = s.artist_id
GROUP BY s2.artist_id
ORDER BY yr DESC);
""")
## UNIQUE TIMSETAMP
time_table_insert = ("""INSERT INTO time_table(start_time, hour, day, week, month, year, weekday)
SELECT start_time 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(DOW FROM start_time) AS weekday
FROM (SELECT distinct ts,'1970-01-01'::date + ts/1000 * interval '1 second' as start_time
FROM staging_events)
WHERE start_time IS NOT NULL;
""")
# 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]