尽管可利用自连接在XQuery中表示分组和聚集，但那非常糟糕。
Although grouping and aggregation can be expressed in XQuery using self-joins, it is quite awkward.
最后，我们可以获取和更新特定分组的聚集信息。
Finally, the aggregation information for a certain group can be retrieved and updated.
包含连接、分组、聚集和排序操作的决策支持查询。
Decision-support queries that involve joins, groups, aggregates and sort operations.
现在，我们可从当前分组（或一个新开始的分组）中获得聚集信息，并将分组信息和传递给UDF 的参数结合起来。
Now we get the aggregation information for the current group (or start a new group) and combine that group information with the parameters that were passed in to the UDF.
实验结果表明，与标准的区分服务网络相比，该方案能在TCP和UDP聚集之间公平地分配带宽并能显著地降低分组丢失率。
The simulation results show that the proposed scheme is capable of protecting aggregated TCP flows from congestion caused by unresponsive UDP flows and reducing packet loss ratio.
分组检验血沉定量增加时其余聚集指标和低切粘度的差异性。
The related degree is high between blood viscosity in low shear rate and erythrooocyte aggregation index.
分组检验血沉定量增加时其余聚集指标和低切粘度的差异性。
The related degree is high between blood viscosity in low shear rate and erythrooocyte aggregation index.
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