这种方法要求联邦系统首先从远程数据源获取由谓词引用的数据的一个超集，然后通过谓词在本地对其进行过滤。
This approach requires the federated system to retrieve a superset of the data referenced by the predicate from the remote data source, and then filter it locally against the predicate.
在第一个查询中，过滤谓词是在由xmltable函数生成的char列“Zip”上表达的。
In the first query, the filtering predicate is expressed on the CHAR column "Zip" generated by the XMLTABLE function.
述谓是句子基本单位，是对句子的抽象化，适用于包括陈述句、祈使句和疑问句。述谓由一个或数个论元和一个谓词组成。
Predication is the abstraction of the meaning of a sentence. it applies to all forms of a sentence, including statements, imperative and interrogative.
述谓是句子基本单位，是对句子的抽象化，适用于包括陈述句、祈使句和疑问句。述谓由一个或数个论元和一个谓词组成。
Predication is the abstraction of the meaning of a sentence. it applies to all forms of a sentence, including statements, imperative and interrogative.
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