"for a description of how to handle measures with multiple aggregation functions 關于如何處理多個聚合函數(shù),請參見“
However, you should consider this approach only if memory is a constraint, because performing multiple aggregations within one aggregate transformation serializes the aggregation operations 但是,只有在內(nèi)存不足時才應考慮這種方法,因為在一個聚合轉(zhuǎn)換內(nèi)執(zhí)行多個聚合會序列化聚合操作。
If you need to create multiple aggregations in a data flow, you should consider creating multiple aggregations using one aggregate transformation instead of creating multiple transformations 如果需要在數(shù)據(jù)流中創(chuàng)建多個聚合,您應該考慮使用一個聚合轉(zhuǎn)換而不是使用多個轉(zhuǎn)換來創(chuàng)建多個聚合。
If you need to create multiple aggregations in a data flow, you should consider creating multiple aggregations using one aggregate transformation instead of creating multiple transformations 如果需要在數(shù)據(jù)流中創(chuàng)建多個聚合,您應該考慮使用一個聚合轉(zhuǎn)換而不是使用多個轉(zhuǎn)換來創(chuàng)建多個聚合。
Unlike symmetric measures, which have one aggregation function applied to the sql expression template for all of the dimensions, asymmetric measures will have multiple aggregation functions applied to the sql template 對于對稱的度量,要將一個聚合函數(shù)應用于所有維的sql表達式模板;但是非對稱度量有多個聚合函數(shù)要應用于sql模板。