Does Heroku allow duplicate application names?

Is it possible to create an application via the Heroku Client and Heroku dashboard?

Is the Heroku Postgres add-on available to install the add-ons page gallery?

When the Heroku Postgres add-on is installed, is it necessary to manually create the first database?

Does the DATABASE_URL variable contain information regarding the database connection?

Does the Heroku Client provide commands to work with PostgreSQL?

Is it possible to copy the Heroku database through the heroku pg:pull command?

Is the heroku pg:promote command helpful to define the main database?

Does the Heroku Postgres add-on not allow connection with programing languages such as Java, Ruby, Python, and Node.js?

Does Heroku Postgres allow multiple schemas in the database?