The derived relational algebra operators are widely used in the relational database query languages.

关系代数的派生算子在关系数据库查询语言中得到了广泛应用。

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This window is very similar to the window for a Relational Database Query feed generator. The window requires.

该窗口与Relational Database Query feed生成器窗口非常类似。

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Referencing the mature and efficient relational database query techniques, and to take the strategy space for time.

借鉴关系数据库成熟高效的查询技术，并采取以空间换时间的策略。

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This traditional database platforms, known as relational database management systems (RDBMS) all use a language called SQL (structured query language).

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With a relational database, you start with the domain objects, and represent them in a way that guarantees that virtually any query can be expressed.

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