QueryQ5对谓词使用索引表，但是需要提取函数（具有XML分析）来检索客户电子邮件地址。
Query Q5 uses side tables for the predicates, but requires an extract function (with XML parsing) to retrieve the customers email addresses.
QueryQ5对谓词使用索引表，但是需要提取函数（具有XML分析）来检索客户电子邮件地址。
Query Q5 uses side tables for the predicates, but requires an extract function (with XML parsing) to retrieve the customers email addresses.
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