公共表表达式(with子句)允许数据更新操作的高效管道。
Common table expressions (the WITH clause) allow efficient pipelining of data-change-operations.
在操作阶段中，该程序对XML文档中的元素进行添加、修改和删除的数据更新操作。
In the manipulating stage, the program makes changes to the data by adding, modifying, and deleting elements in the XML document.
在本例中，某些数据库更新操作可能会被反转，而另外一些不会，有时需要手动干预修复这一问题。
In this case some database update operations might be reversed while others are not, sometimes requiring manual intervention to fix the problem.
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