The most direct ideas of this paper is the operator group theory in group-theory.

本文想法的直接背景是群论中的算子群理论。

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An operation can be a relational operator, a system - or user-defined function, or an SQL operator, such as GROUP BY, ORDER BY, and so on.

操作可以是一个关系运算符，或者系统或用户定义的函数，也可以是一个sql操作符，例如GROUP BY、ORDER BY等。

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Complete the following steps to create and program the Group By operator.

完成以下步骤，创建Group By操作符并对它进行配置。

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The CME Group, operator of the Chicago Mercantile Exchange, is one of the world's largest traders of derivatives.

VOA: special.2011.02.18

After two men died of heat-related causes in Moscow's metro, a consumer group sued the transit operator to bring down temperatures to the legal maximum of 32 degrees centigrade.

VOA: standard.2010.07.23

Exchange operator CME Group and Citadel Investment Group are hoping to change that.

FORBES: Magazine Article

It bought Europe's third-biggest mobile phone operator, Orange, in 2000 from UK mobile phone operator Vodafone Group, Europe's biggest mobile phone company.

CNN: Telecom operators: France Telecom

Another UK prison operator, Group 4, is also expanding into southern Africa.

BBC: Criminal justice reshaped