(: XQuery Aggregate Query :) | |
(: Find the lowest min temperature. :) | |
fn:min( | |
let $collection := "ghcnd_quarter_1|ghcnd_quarter_2|ghcnd_quarter_3|ghcnd_quarter_4" | |
for $r in collection($collection)/dataCollection/data | |
where $r/dataType eq "TMIN" | |
return $r/value | |
) |