| (: XQuery Filter Query :) |
| (: See historical data for Riverside, CA (AS000000003) station by selecting :) |
| (: the weather readings for December 25 over the last 10 years. :) |
| let $collection := "ghcnd_quarter_1|ghcnd_quarter_2|ghcnd_quarter_3|ghcnd_quarter_4" |
| for $r in collection($collection)/dataCollection/data |
| let $datetime := xs:dateTime(fn:data($r/date)) |
| where $r/station eq "GHCND:AS000000003" |
| and fn:year-from-dateTime($datetime) ge 2000 |
| and fn:month-from-dateTime($datetime) eq 3 |
| and fn:day-from-dateTime($datetime) eq 3 |
| return $r |
