Three-way join in a where clause : Join « XQuery « XML

1. XML
2. XQuery
3. Join

Three-way join in a where clause

File: order.xml


<order>
  <car model="A">
    <id>0001</id>
    <name language="en">name 1</name>
    <colorChoices>navy black</colorChoices>
  </car>
  <car model="B">
    <id>0002</id>
    <name language="en">name 2</name>
  </car>
  <car model="B">
    <id>0003</id>
    <name language="en">name 3</name>
  </car>
</order>

File: inventory.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" color="red"/>
  <car model="B" id="0003" quantity="2" color="red"/>
  <car model="C" id="0004" quantity="1" color="white"/>
  <car model="C" id="0004" quantity="1" color="gray"/>
  <car model="A" id="0001" quantity="1" color="black"/>
</inventory>



File: Query.xquery

for $car in doc("inventory.xml")//car,
    $car in doc("order.xml")//car,
    $price in doc("prices.xml")//prices/priceList/prod
where $car/@id = $car/id and $car/id = $price/@id
return <car id="{$car/@id}"
             name="{$car/name}"
             price="{$price/price}"/>

 

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