| (: Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. :) |
| |
| (: |
| XQuery Join Query |
| ------------------- |
| Find all the weather readings for Washington state for a specific day 1976/7/4. |
| :) |
| let $station_collection := "/tmp/1.0_partition_ghcnd_all_xml/stations" |
| for $s in collection($station_collection) |
| for $station in $s("stationCollection")("station") |
| let $sensor_collection := "/tmp/1.0_partition_ghcnd_all_xml/sensors" |
| for $r in collection($sensor_collection) |
| for $data in $r("dataCollection")("data") |
| where $station("id") eq $data("station") |
| and (some $x in $station("locationLabels") satisfies ($x("type") eq "ST" and fn:upper-case(fn:data($x("displayName"))) eq "WASHINGTON")) |
| and xs:dateTime(fn:data($data("date"))) eq xs:dateTime("1976-07-04T00:00:00.000") |
| return $data |