与大多数现代编程语言一样，需要使用AND和OR语句对表达式或它们的值进行条件运算。
Like in most modern programming languages, the and and or statements are necessary for definitive conditional evaluations of expressions or their values.
与属性相似，度量是组成事实对象的表上的列或列表达式。
Measures, like attributes, are columns or column expressions on the tables that make up a facts object.
与在单个dbspace中保存多个表或索引片段提高了查询性能，这样做胜过将每个分段表达式存储在不同的dbspace中。
Storing multiple table or index fragments in a single dbspace improves query performance over storing each fragmented expression in a different dbspace.
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