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
user_table_create = ("""
create table if not exists users(
user_id int primary key,
first_name varchar,
last_name varchar,
gender varchar,
level varchar
);
""")

song_table_create = ("""
create table if not exists songs(
song_id varchar primary key,
title varchar not null,
artist_id varchar,
year int,
duration numeric not null
);
""")

artist_table_create = ("""
create table if not exists artists(
artist_id varchar primary key,
name varchar not null,
location varchar,
latitude text,
longitude text
);
""")

time_table_create = ("""
create table if not exists time(
start_time time unique,
hour int,
day int,
week int,
month int,
year int,
weekday int
);
""")

songplay_table_create = ("""
create table if not exists songplays(
songplay_id SERIAL primary key, 
start_time time references time(start_time), 
user_id int not null references users(user_id),
level varchar not null,
song_id varchar references songs(song_id), 
artist_id varchar references artists(artist_id), 
session_id int not null,
location varchar,
user_agent varchar 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)
                            ON CONFLICT DO NOTHING;
""")

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, a.artist_id\
                  from songs s 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 = [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]