Exemplo: construir irmãos com o modo EXPLICIT

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Aplica-se a:SQL ServerBanco de Dados SQL do AzureInstância Gerenciada de SQL do Azure

Assuma que você quer construir XML que forneça informações de pedidos de vendas. Neste exemplo, os elementos <SalesPerson> e <OrderDetail> são irmãos. Cada Pedido tem um elemento <OrderHeader>, um elemento <SalesPerson> e um ou mais elementos <OrderDetail>.

<OrderHeader SalesOrderID=... OrderDate=... CustomerID=... >
  <SalesPerson SalesPersonID=... />
  <OrderDetail SalesOrderID=... LineTotal=... ProductID=... OrderQty=... />
  <OrderDetail SalesOrderID=... LineTotal=... ProductID=... OrderQty=.../>
      ...
</OrderHeader>
<OrderHeader ...</OrderHeader>

A consulta em modo EXPLICIT a seguir constrói esse XML. A consulta especifica valores Tag de 1 para o elemento <OrderHeader>, 2 para o elemento <SalesPerson> e 3 para o elemento <OrderDetail>. Como <SalesPerson> e <OrderDetail> são irmãos, a consulta especifica o mesmo valor de marca Parent de 1 identificando o elemento <OrderHeader>.

USE AdventureWorks2022;
GO
SELECT  1 as Tag,
        0 as Parent,
        SalesOrderID  as [OrderHeader!1!SalesOrderID],
        OrderDate     as [OrderHeader!1!OrderDate],
        CustomerID    as [OrderHeader!1!CustomerID],
        NULL          as [SalesPerson!2!SalesPersonID],
        NULL          as [OrderDetail!3!SalesOrderID],
        NULL          as [OrderDetail!3!LineTotal],
        NULL          as [OrderDetail!3!ProductID],
        NULL          as [OrderDetail!3!OrderQty]
FROM   Sales.SalesOrderHeader
WHERE     SalesOrderID=43659 or SalesOrderID=43661
UNION ALL
SELECT 2 as Tag,
       1 as Parent,
        SalesOrderID,
        NULL,
        NULL,
        SalesPersonID,
        NULL,
        NULL,
        NULL,
        NULL
FROM   Sales.SalesOrderHeader
WHERE     SalesOrderID=43659 or SalesOrderID=43661
UNION ALL
SELECT 3 as Tag,
       1 as Parent,
        SOD.SalesOrderID,
        NULL,
        NULL,
        SalesPersonID,
        SOH.SalesOrderID,
        LineTotal,
        ProductID,
        OrderQty
FROM    Sales.SalesOrderHeader SOH,Sales.SalesOrderDetail SOD
WHERE   SOH.SalesOrderID = SOD.SalesOrderID
AND     (SOH.SalesOrderID=43659 or SOH.SalesOrderID=43661)
ORDER BY [OrderHeader!1!SalesOrderID], [SalesPerson!2!SalesPersonID],
         [OrderDetail!3!SalesOrderID],[OrderDetail!3!LineTotal]
FOR XML EXPLICIT;

Este é o resultado parcial:

<OrderHeader SalesOrderID="43659" OrderDate="2005-07-01T00:00:00" CustomerID="676">
  <SalesPerson SalesPersonID="279" />
  <OrderDetail SalesOrderID="43659" LineTotal="10.373000" ProductID="712" OrderQty="2" />
  <OrderDetail SalesOrderID="43659" LineTotal="28.840400" ProductID="716" OrderQty="1" />
  <OrderDetail SalesOrderID="43659" LineTotal="34.200000" ProductID="709" OrderQty="6" />
    ...
</OrderHeader>
<OrderHeader SalesOrderID="43661" OrderDate="2005-07-01T00:00:00" CustomerID="442">
  <SalesPerson SalesPersonID="282" />
  <OrderDetail SalesOrderID="43661" LineTotal="20.746000" ProductID="712" OrderQty="4" />
  <OrderDetail SalesOrderID="43661" LineTotal="40.373000" ProductID="711" OrderQty="2" />
  ...
</OrderHeader>

Confira também