A common error is to write the previous query without the square brackets in the XMLEXISTS function.

一种常见的错误是在xmlexists函数中不使用方括号来编写前面的查询。

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Therefore, it might be worthwhile to restructure your spatial query to ensure just a single call to the constructor function using common table expressions.

因此，可能有必要使用公共表表达式重新构造空间查询，以确保只调用一次构造函数。

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This kind of query can be used for various analytic processing needs, but the RegexMatches function can also be used for more common tasks.

此类查询可用于满足各种分析处理需求，而RegexMatches函数还可用于执行常见的任务。

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