Demonstrated how to extract data by writing SQL queries.

演示了如何通过编写SQL查询提取数据。

youdao

The second problem in using extract filter files is in designing useful SQL queries.

在使用提取过滤器文件中的第二个问题是设计有用的SQL查询。

youdao

EPL is a powerful language that enables you, the developer, to implement a comprehensive range of queries to "extract" the events from the incoming data and invoke your business logic (POJO).

EPL是一种强大的语言，可使开发者实现对事件的全程查询(从输入数据中“提取”事件并调用你的业务逻辑(POJO))。

youdao

The master model will likely be much more like a master data management system or a complex of federated queries that extract data that then may be used in a data mart for special purposes.

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