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This does not provide much control over the shape of the XML generated from a query result. The AUTO mode queries are useful if you want to generate simple hierarchies. The first, leftmost table that is identified forms the top element in the resulting XML document.
The second leftmost table, identified by columns in the SELECT statement, forms a subelement within the top element, and so on. If a column name listed in the SELECT clause is from a table that is already identified by a previously specified column in the SELECT clause, the column is added as an attribute of the element already created, instead of opening a new level of hierarchy.
For example, execute this query: Dies ist das Teilergebnis: This is the partial result: The CustomerID references the Cust table. Status auf die OrderHeader-Tabelle. Next, three columns, OrderHeader. Status, reference the OrderHeader table. CustomerType column again references the Cust table that was already identified by the Cust. Aus diesem Grund wird kein neues Element erstellt. Therefore, no new element is created.
The query specifies aliases for the table names. Diese Aliasnamen erscheinen als die entsprechenden Elementnamen. These aliases appear as corresponding element names. If CustomerID is not identified as the primary key for the table, all the column values CustomerID, CustomerType in this query are compared from one row to the next.
When comparing these column values, if any of the columns to be compared are of type text , ntext , image , or xml , FOR XML assumes that the values are different and not compared, even though they may be the same.
This is because comparing large objects is not supported. Elements are added to the result for each row selected. Beachten Sie, dass die Spalten des Datentyps n varchar max und varbinary max verglichen werden. Note that columns of n varchar max and varbinary max are compared.
When a column in the SELECT clause cannot be associated with any of the tables identified in the FROM clause, as in the case of an aggregate column or computed column, the column is added in the XML document in the deepest nesting level in place when it is encountered in the list. The following topics provide more information about AUTO mode: CustomerID for xml auto Dies ist das Teilergebnis: