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| to you under the Apache License, Version 2.0 (the |
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| under the License. :) |
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| (: |
| XQuery Join Aggregate Query |
| ------------------- |
| Count all sensor readings for TMIN in 2001. |
| :) |
| count( |
| let $sensor_collection := "/tmp/1.0_partition_ghcnd_all_xml/sensors" |
| for $r in collection($sensor_collection) |
| for $data in $r("dataCollection")("data") |
| let $date := xs:date(fn:substring(xs:string(fn:data($data("date"))), 0, 11)) |
| where $data("dataType") eq "TMIN" |
| and fn:year-from-date($date) eq 2001 |
| return $data("value") |
| ) |