Summary tables are required in a data warehouse for fast query processing and to allow users to drill up and down into the facts.

在数据仓库中需要汇总表，来实现快速查询，并允许用户在事实表中钻入钻出。

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Summary tables are an important part of creating a high-performance data warehouse.

汇总表是创建高性能数据仓库的重要部分。

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A well-designed data warehouse has a pyramid of summary tables, each one containing more detail until you arrive at the fact table, at the bottom of the pyramid.

一个设计良好的数据仓库拥有由大量汇总表，形成一个“金字塔”，每个汇总表都包含更多细节，直到金字塔底部的事实表。

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