FQL is a query language that allows you to retrieve, filter and project data from any data source containing FHIR Resources. It brings the power of three existing languages together: SQL, JSON and FhirPath. It allows you to create tables and is useful for gaining insight and perform quality control.
This project is no longer active, and it is not being updated. Up-to-date information can be found in the new project, which is available here: https://simplifier.net/finnishphrr4