In order to create a dataclip, it is necessary to access https://dataclips.heroku.com; this provides a web tool that allows you to create and manage your dataclips.
The Heroku dataclips web tool
To create a new dataclip, you should follow these steps:
First, click on the Create Dataclip button.
Then, on the next screen, enter the name of your dataclip, choose the database, and type the SQL query that returns the desired results.
Finally, click on the Create Dataclip button.
The following screenshot shows the first five tables of pg_tables:
The first five tables in pg_tables
You can change your SQL query at any time. To do this, just change your query and click on the Update Query button.
Every time you change the query, a new version is automatically created...