| (: XQuery Join Aggregate Query :) | |
| (: Count all stations in the United States. :) | |
| count( | |
| let $station_collection := "/tmp/1.0_partition_ghcnd_all_xml/stations" | |
| for $s in collection($station_collection)/stationCollection/station | |
| where (some $x in $s/locationLabels satisfies ($x/type eq "CNTRY" and $x/id eq "FIPS:US")) | |
| return $s | |
| ) |