Users can construct virtual columns from any combination of columns within a table and then analyze those virtual columns in turn.

用户可以使用表中任意的列组合构造虚拟列，然后依次分析那些虚拟列。

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First analyze the access plan that the optimizer chooses when no distribution statistics are available, which is only basic statistics for the table CARS, and that its indexes exist.

首先来分析一下，在没有分布统计信息，而只有cars表的基本统计信息及其索引的情况下，优化器选择的访问计划是怎样的。

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The unique aspect in this case is that you also use a DataPilot table to display and analyze the data.

这个示例的独特性在于您还使用一个datapilot表来显示和分析数据。

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