This tutorial demonstrates how to query data in Apache Druid using SQL. It assumes that you've completed the Quickstart or one of the following tutorials, since we'll query datasources that you would ...

The main objective of this tutorial is to export a CSV file using a query on an imported (:ref:`tutorial_first_steps`) and enriched (:ref:`tutorial_enrichment`) corpus. This tutorial is available as a ...

Query federation is a way to make use of distributed data sources on the Web, including many SPARQL endpoints as well as relational databases. SWObjects makes use of mapping rules represented as ...