合并键 meaning in Chinese

merge key

Secondly , a database - populating mechanism is built , along with some object - manipulating operations needed for flexible database design , to support data extraction from huge text stream . thirdly , top - down and bottom - up strategies are combined to design a new extraction algorithm that can extract data from data sources with optional , unordered , nested , and or noisy components
本文采用关系数据库来组装抽取对象，给出了将任何ere de -树映射成关系数据库模式的算法，这一数据库映射机制不仅能够支持海量文本流的数据抽取，还支持合并键定义等抽取对象控制操作，可实现灵活的数据库模式设计和数据抽取。