| (: XQuery Join Aggregate Query :) |
| (: Find the lowest recorded temperature (TMIN) in the state of Oregon for :) |
| (: 2001. :) |
| fn:min( |
| let $collection1 := "/tmp/1.0_partition_ghcnd_all_xml/stations" |
| for $s in collection($collection1)/stationCollection/station |
| |
| let $collection2 := "/tmp/1.0_partition_ghcnd_all_xml/sensors" |
| for $r in collection($collection2)/dataCollection/data |
| |
| let $date := xs:date(fn:substring(xs:string(fn:data($r/date)), 0, 11)) |
| where $s/id eq $r/station |
| and (some $x in $s/locationLabels satisfies ($x/type eq "ST" and $x/displayName eq "Oregon")) |
| and $r/dataType eq "TMIN" |
| and fn:year-from-date($date) eq 2001 |
| return $r/value |
| ) div 10 |
