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.
CodeSystem
Das CodeSystem BeforeOrAfter1991 enthält die Codes zur Angabe für vor 1991 und für 1991 und später.