| (: XQuery Join Query :) |
| (: Find all the weather readings for Washington state for a specific day :) |
| (: 2002-2-2. :) |
| let $station_collection := "ghcnd_quarter_1|ghcnd_quarter_2|ghcnd_quarter_3|ghcnd_quarter_4" |
| for $s in collection($station_collection)/stationCollection/station |
| |
| let $sensor_collection := "ghcnd_quarter_1|ghcnd_quarter_2|ghcnd_quarter_3|ghcnd_quarter_4" |
| for $r in collection($sensor_collection)/dataCollection/data |
| |
| where $s/id eq $r/station |
| and (some $x in $s/locationLabels satisfies ($x/type eq "ST" and fn:upper-case(fn:data($x/displayName)) eq "STATE 1")) |
| and xs:dateTime(fn:data($r/date)) eq xs:dateTime("2002-02-02T00:00:00.000") |
| return $r |
