本章节包含查询运算式中使用的内容关键字。

This section contains the contextual keywords used in query expressions.

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查询是储存在查询变数中，并以查询运算式初始化。

A query is stored in a query variable and initialized with a query expression.

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初始设定式通常会用在将来源资料规划为新资料型别的查询运算式中。

Initializers are typically used in query expressions when they project the source data into a new data type.

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