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i.eis.luzzu-webapp.2.0.1.source-code.GetLatestObservedValuesForDataset.sparql Maven / Gradle / Ivy

PREFIX daq:
PREFIX rdf:
PREFIX rdfs:
PREFIX xsd:
PREFIX sdmx-dimension:

SELECT DISTINCT ?metric ?value {
	?obs a daq:Observation ;
		daq:metric ?metric_instance ;
		daq:value ?value ;
		sdmx-dimension:timePeriod ?dateTime 
	
	# This filter eliminates any solution (triples) that
	# have a date time older than the newest observation
	FILTER NOT EXISTS {
       	?obs2 daq:metric ?metric_instance ;
          	  sdmx-dimension:timePeriod ?newerDateTime  .
      	FILTER (?newerDateTime > ?dateTime) 
	} 
  
  	?metric_instance a ?metric .
} ORDER BY ASC(?metric)