Of course, you can write more selective SQL queries that incorporate relational projection and restriction operations.

当然也可以编写更具选择性的SQL查询，使之包含关系投影和限制操作。

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Listing 2 shows an example of using ParallelArray to summarize student grades, illustrating the basic operations of selection, projection, and summarization.

清单2显示的示例使用ParallelArray对学生成绩进行汇总，演示了选择、处理和汇总的基本操作。

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When relational tuples are flowing from mass storage to host via this filter, the unary operations of relational algebra for them such as projection and selection are completed parallelly.

使关系元组在由外存至主机的流动过程中就并行完成筛选、投影关系代数的一元运算。

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September 13, 2012 Fujifilm has mainly provided negative films for shooting and positive films for projection in its motion picture film business operations.

ENGADGET: Fujifilm sees which way wind is blowing, ends production of cinema film

However, in order to adapt to the recent rapid transition of digitalization in the shooting, producing, projecting and archiving processes of motion pictures Fujifilm has decided to shift its business operations to provide products and services designed for digital workflow of motion picture production and projection.

ENGADGET: Fujifilm sees which way wind is blowing, ends production of cinema film