Operators for aggregation, combination, and such manipulation are provided by means of operators that could take members, attributes, or constants as inputs.

聚合、组合之类操作的操作符可以是以成员、属性或常量作为输入的操作符。

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Constants cannot be initialized with query expressions because constants may only be initialized with some combination of literals, named constants, and mathematical operators.

常量不能用查询表达式进行初始化，因为常量只能用文本、命名常量和数学运算符的某一组合进行初始化。

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Constants cannot be initialized with query expressions because constants may only be initialized with some combination of literals, named constants, and mathematical operators.

常量不能用查询表达式进行初始化，因为常量只能用文本、命名常量和数学运算符的某一组合进行初始化。

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