noaa-ghcn-daily.queries.q05.xq Maven / Gradle / Ivy
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(: XQuery Join Aggregate Query :)
(: Find the lowest recorded temperature (TMIN) in the United States for :)
(: 2001. :)
fn:min(
let $station_collection := "/tmp/1.0_partition_ghcnd_all_xml/stations"
for $s in collection($station_collection)/stationCollection/station
let $sensor_collection := "/tmp/1.0_partition_ghcnd_all_xml/sensors"
for $r in collection($sensor_collection)/dataCollection/data
where $s/id eq $r/station
and (some $x in $s/locationLabels satisfies ($x/type eq "CNTRY" and $x/id eq "FIPS:US"))
and $r/dataType eq "TMIN"
and fn:year-from-dateTime(xs:dateTime(fn:data($r/date))) eq 2001
return $r/value
) div 10