清单3包含有这个函数，它尝试打开数据库(如果尚未打开的话)并查询数据库。
Listing 3 contains this function, which attempts to open the database (if not already opened) and query the database.
尽管该过程非常简单，但是也能帮助您理解如何使用内置向导生成基于SQL的过程来查询并返回XML数据。
Although this procedure is quite simple, it helps you understand how to generate SQL-based procedures that query and return XML data using built-in wizards.
这可极大改善从一个或多个集群维数限定并选择数据的那些查询的性能。
This can greatly improve the performance of queries that constrain and select data along one or multiple clustering dimensions.
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