Use AUTO Mode with FOR XML (SQL Server 2012) Multiple Table

 SELECT Cust.CustomerID,
        OrderHeader.CustomerID,
        OrderHeader.SalesOrderID,
        OrderHeader.Status
 FROM Sales.Customer Cust, Sales.SalesOrderHeader OrderHeader
 WHERE Cust.CustomerID = OrderHeader.CustomerID

 SELECT Cust.CustomerID,
        OrderHeader.CustomerID,
        OrderHeader.SalesOrderID,
        OrderHeader.Status
 FROM Sales.Customer Cust, Sales.SalesOrderHeader OrderHeader
 WHERE Cust.CustomerID = OrderHeader.CustomerID
 FOR XML AUTO

<Cust CustomerID="29825">
  <OrderHeader CustomerID="29825" SalesOrderID="43659" Status="5" />
</Cust>
<Cust CustomerID="29672">
  <OrderHeader CustomerID="29672" SalesOrderID="43660" Status="5" />
</Cust>
<Cust CustomerID="29734">
  <OrderHeader CustomerID="29734" SalesOrderID="43661" Status="5" />
</Cust>
<Cust CustomerID="29994">
  <OrderHeader CustomerID="29994" SalesOrderID="43662" Status="5" />
</Cust>
<Cust CustomerID="29565">
  <OrderHeader CustomerID="29565" SalesOrderID="43663" Status="5" />
</Cust>
<Cust CustomerID="29898">
  <OrderHeader CustomerID="29898" SalesOrderID="43664" Status="5" />
</Cust>

 select OrderHeader.CustomerID,
        Cust.CustomerID,
        OrderHeader.SalesOrderID,
        OrderHeader.Status
 from Sales.Customer Cust, Sales.SalesOrderHeader OrderHeader
 where Cust.CustomerID = OrderHeader.CustomerID
 for xml auto

<OrderHeader CustomerID="29825" SalesOrderID="43659" Status="5">
  <Cust CustomerID="29825" />
</OrderHeader>
<OrderHeader CustomerID="29672" SalesOrderID="43660" Status="5">
  <Cust CustomerID="29672" />
</OrderHeader>
<OrderHeader CustomerID="29734" SalesOrderID="43661" Status="5">
  <Cust CustomerID="29734" />
</OrderHeader>
<OrderHeader CustomerID="29994" SalesOrderID="43662" Status="5">
  <Cust CustomerID="29994" />
</OrderHeader>
<OrderHeader CustomerID="29565" SalesOrderID="43663" Status="5">
  <Cust CustomerID="29565" />
</OrderHeader>
<OrderHeader CustomerID="29898" SalesOrderID="43664" Status="5">
  <Cust CustomerID="29898" />
</OrderHeader>

关于SELECT 字句：

Cust 为Sales.Customer的别名，OrderHeader 为Sales.SalesOrderHeader的别名

属性内容参考第一列所属表(包含列中的所有表)，属性则参考其余表