Aggregation : Aggregate « XQuery « XML

1. XML
2. XQuery
3. Aggregate

Aggregation

File: Data.xml

<employees>
  <employee name="James" salary="1234" yearServed="1" location="North"/>
  <employee name="Joe"   salary="3211" yearServed="2" location="South"/>
  <employee name="Jod"   salary="3422" yearServed="3" location="North"/>
  <employee name="Jason" salary="1321" yearServed="4" location="East"/>
  <employee name="Jack"  salary="2324" yearServed="3" location="North"/>
  <employee name="Jeep"  salary="4321" yearServed="2" location="East"/>
  <employee name="Jane"  salary="2344" yearServed="1" location="South"/>
</employees>

File: Query.xquery

for $d in distinct-values(doc("Data.xml")//employee/@location)
let $employees := doc("Data.xml")//employee[@location = $d]
order by $d
return <department code="{$d}"
                   numemployees="{count($employees)}"
                   distinct="{count(distinct-values($employees/@yearServed))}"
                   total="{sum($employees/@yearServed)}"/>

Output:

<?xml version="1.0" encoding="UTF-8"?>
<department total="6" code="East" distinct="2" numemployees="2"/>
<department total="7" code="North" distinct="2" numemployees="3"/>
<department total="3" code="South" distinct="2" numemployees="2"/>

 

Related examples in the same category