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OLAP 查询通常将事实表的许多行聚合成一个相对少量的汇总结果。
OLAP queries typically aggregate many rows of the fact table into a relatively small number of summary results.
汇总表是指其定义基于查询结果的表。
A summary table is a table whose definition is based on a result of a query.
运行该查询时，结果集将包含带有汇总信息的单行。
When you run the query, the result set contains a single row with the summary information.
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