Columns that Contain a Null Value By Default
Applies To: SQL Server 2016
By default, a null value in a column maps to the absence of the attribute, node, or element. This default behavior can be overwritten by requesting element-centric XML using the ELEMENTS directive and specifying XSINIL to request adding elements for NULL values, as shown in the following query:
SELECT EmployeeID as "@EmpID", FirstName as "EmpName/First", MiddleName as "EmpName/Middle", LastName as "EmpName/Last" FROM HumanResources.Employee E, Person.Contact C WHERE E.EmployeeID = C.ContactID AND E.EmployeeID=1 FOR XML PATH, ELEMENTS XSINIL
The following shows the result. Note that if XSINIL is not specified, the <
Middle> element will be absent.
<row xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" EmpID="1"> <EmpName> <First>Gustavo</First> <Middle xsi:nil="true" /> <Last>Achong</Last> </EmpName> </row>