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.
清单 3中的示例显示了使用公共表表达式创建结构化的 XML。
The example in Listing 3 shows the creation of structured XML using common table expressions.
注意，已为每个副本组创建了一个公共表表达式(第2、18和38行)。
Notice that for each repetition group a common table expression has been created (lines 2, 18 and 38).
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