PostgreSQL data modelling project from Udacity DE nanodegree

Here is the generated star schema of the data collected from JSON files:

Description of what each file is doing:

• test.ipynb displays few rows of each table to validate the work done.
• create_tables.py drops and creates the tables, to rest the tables if you want.
• etl.py reads and processes all files from song_data and log_data and loads them into the tables.
• sql_queries.py contains all sql queries, and is imported into the last three files above.