noaa-ghcn-daily.other_systems.saxon.q05_count_sensor.xq Maven / Gradle / Ivy
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(: XQuery Join Aggregate Query :)
(: Count all sensor readings for TMIN in 2001. :)
count(
let $sensor_collection := "../../../../../../../weather_data/dataset-tiny-local/data_links/local_speed_up/d0_p1_i0/sensors/?select=*.xml;recurse=yes"
for $r in collection($sensor_collection)/root/dataCollection/data
let $date := xs:date(fn:substring(xs:string(fn:data($r/date)), 0, 11))
where $r/dataType eq "TMIN"
and fn:year-from-date($date) eq 2001
return $r/value
)