Hello,

On chapter 5.1.1 Capsule review.

The Postgis SQL Query Editor plugin that you mention for QGIS is deprecated for some time and is replaced by DB Manager - a core plugin. For now it has support for SQLITE and Postgis.

https://www.qgis.org/en/docs/user_manual/plugins/plugins_db_manager.html
http://www.qgis.org/en/docs/training_manual/databases/db_manager.html

Great book,

Thank you,

Tudor

Barascu,

Thanks for the notice. We'll be sure to update before final release.

Thanks,
Regina