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Columns with a name specified as a wildcard character

  • Artikel

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance

If the column name specified is a wildcard character (*), the content of that column is inserted as if there's no column name specified. If this column is a non-xml type column, the column content is inserted as a text node, as shown in the following example:

USE AdventureWorks2022;
GO
SELECT E.BusinessEntityID "@EmpID",
       FirstName "*",
       MiddleName "*",
       LastName "*"
FROM   HumanResources.Employee AS E
  INNER JOIN Person.Person AS P
    ON E.BusinessEntityID = P.BusinessEntityID
WHERE E.BusinessEntityID=1
FOR XML PATH;

This is the result:

<row EmpID="1">KenJSánchez</row>

If the column is of xml type, the corresponding XML tree is inserted. For example, the following query specifies "*" for the column name that contains the XML returned by the XQuery against the Instructions column.

SELECT
       ProductModelID,
       Name,
       Instructions.query('declare namespace MI="https://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelManuInstructions"
                /MI:root/MI:Location
              ') as "*"
FROM Production.ProductModel
WHERE ProductModelID=7
FOR XML PATH;

This is the result. The XML returned by XQuery is inserted without a wrapping element.

<row>
  <ProductModelID>7</ProductModelID>
  <Name>HL Touring Frame</Name>
  <MI:Location LocationID="10">...</MI:Location>
  <MI:Location LocationID="20">...</MI:Location>
  ...
</row>

See also