...r)MT.2主轴转速范围(Spindle speeds range)365-3150rpm主轴转速级数(Spindle speeds series) 5工作台面尺寸(Dimension of table)底座315×335mm总高(Overall height)1500mm电动机(Motor)750W毛重/净重(G.W./N.W.
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Each join reduces the size of the fact table by one-tenth due to selectivity of the table filter on each dimension table.
由于每个维度表过滤的选择度，每次连接都会减少事实表大小的十分之一。
The optimizer will recognize this index and use the filters on the dimension tables to generate a list of valid combinations of the dimension tables' keys into a temp table.
该优化器将可以识别出这个索引，在维度表上使用过滤器来在一个临时表中生成一个维度表键的有效组合列表。
The performance improvement depends on the selectivity of the filter on the dimension table from which the join keys are pushed down.
性能的提高取决于连接键被下推时所在维度表的过滤选择度。
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