noaa-ghcn-daily.queries.q07.xq Maven / Gradle / Ivy
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(: XQuery Self Join Query :)
(: Self join with all stations finding the difference in min and max :)
(: temperature and get the average. :)
fn:avg(
let $sensor_collection_min := "/tmp/1.0_partition_ghcnd_all_xml/sensors"
for $r_min in collection($sensor_collection_min)/dataCollection/data
let $sensor_collection_max := "/tmp/1.0_partition_ghcnd_all_xml/sensors"
for $r_max in collection($sensor_collection_max)/dataCollection/data
where $r_min/station eq $r_max/station
and $r_min/date eq $r_max/date
and $r_min/dataType eq "TMIN"
and $r_max/dataType eq "TMAX"
return $r_max/value - $r_min/value
) div 10