Grouping by department : group « XQuery « XML

1. XML
2. XQuery
3. group

Grouping by department

File: Data.xml

<inventory id="inv0001" date="2008-12-19" loc="USA">
  <car model="A" id="0001" quantity="1" color="navy"/>
  <car model="B" id="0002" quantity="1"/>
  <car model="B" id="0003" quantity="2"/>
  <car model="C" id="0004" quantity="1" color="white"/>
  <car model="A" id="0001" quantity="1" color="black"/>
</inventory>




File: Query.xquery

for $d in distinct-values(doc("Data.xml")//car/@model)
let $cars := doc("Data.xml")//car[@model = $d]
order by $d
return <department code="{$d}">{
         for $i in $cars
         order by $i/@id
         return $i
       }</department>


Output:

<?xml version="1.0" encoding="UTF-8"?>
<department code="A">
   <car model="A" id="0001" quantity="1" color="navy"/>
   <car model="A" id="0001" quantity="1" color="black"/>
</department>
<department code="B">
   <car model="B" id="0002" quantity="1"/>
   <car model="B" id="0003" quantity="2"/>
</department>
<department code="C">
   <car model="C" id="0004" quantity="1" color="white"/>
</department>

 

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