我曾经遇到过一个超过100条电子邮件规则记录的配置，其中90%都是基于查询的。

I have walked into configurations which had over 100 E-mail rule records, 90 percent of which were query-based.

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该查询导致DB2返回它在每个符合条件的XML文档(客户联系方式记录)中找到的第一个电子邮件元素。

This query causes DB2 to return the first E-mail element it finds within each qualifying XML document (customer contact record).

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