Source sqlite database : https://www.w3resource.com/sqlite-exercises/ Sample postgresql database :

• https://www.postgresqltutorial.com/postgresql-getting-started/postgresql-sample-database/

• https://www.postgresqltutorial.com/wp-content/uploads/2018/03/printable-postgresql-sample-database-diagram.pdf

• https://www.postgresqltutorial.com/postgresql-getting-started/load-postgresql-sample-database/

• https://github.com/ghusta/docker-postgres-world-db

database : world-db
user : world
password : world123