sql_queries.py

# DROP TABLES created by esraa ahmed

songplay_table_drop = "DROP table IF EXISTS song_plays"
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 song_plays (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 NOT NULL, 
                          location text, 
                          user_agent varchar);""")

user_table_create = ("""CREATE TABLE IF NOT EXISTS users (user_id int PRIMARY KEY,
                                                          first_name varchar NOT NULL,
                                                          last_name varchar NOT NULL,
                                                          gender varchar,
                                                          level varchar);""")

song_table_create = ("""CREATE TABLE IF NOT EXISTS songs (song_id varchar NOT NULL PRIMARY KEY,
                                                          title varchar NOT NULL,
                                                          artist_id varchar NOT NULL, 
                                                          year int  NOT NULL, 
                                                          duration numeric NOT NULL);
""")

artist_table_create = ("""CREATE TABLE IF NOT EXISTS artists (artist_id varchar NOT NULL PRIMARY KEY,
                                                              name varchar NOT NULL,
                                                              location text,
                                                              longitude float, 
                                                              latitude float);""")

time_table_create = ("""CREATE TABLE IF NOT EXISTS time (start_time timestamp PRIMARY KEY,
                                                         hour int,
                                                         day int,
                                                         week int,
                                                         month int,
                                                         year int, 
                                                         weekday int);
""")

# INSERT RECORDS

songplay_table_insert = ("""INSERT INTO song_plays(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 (songplay_id)
                          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 (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, s.artist_id
                  FROM songs s INNER JOIN artists a ON \
                  a.artist_id = s.artist_id
                  WHERE s.title = %s
                  AND a.name = %s
                  AND s.duration = %s;
""")

# QUERY LISTS created by esraa ahmed on 18/07/2022

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]