1·If a measure has more than one aggregation function in its list of aggregations, then the measure is an asymmetric measure.
如果一个度量在它的聚合列表中有多个聚合函数，那么这个度量就是非对称的度量。
2·If not, specific transformations, merges, or aggregations may be required to appropriately consolidate the data.
如果没有，则可能需要特定的转换、合并或聚合，以适当地合并数据。
3·It also helps in types of relationship between source and target, such as aggregations, transformations, and arithmetic operations.
它还有助于确定源和目标之间的关系类型，比如聚合、转换和算术运算。
4·A measure must have one aggregation with an empty list of dimensions, and any other aggregations must each have an explicit list of dimensions.
一个度量必须有一个维列表为空的聚合，其他聚合必须都具有明确的维列表。
5·The query model defines the concepts of dimension selections, edges, cube views, and the aggregations and manipulations of dimensional data.
查询模型定义维度选择、边界、立方体视图以及维度数据的聚合与操纵等概念。
1·Note that a single SQL statement can contain multiple aggregations.
注意，一条sql语句中可以包含多个聚集。