如果创建了一个临时表空间, 会创建一个排序段( sort segment), 它将在需要时进行扩展以容纳 所有正在进行的排序。 在数据库关闭与重新启动之后, 排序段才不再存在。
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怎样进行排序是交集下一阶段的工作,排序会产生匹配的替代。
What sorts it out is the next stage of Intersection, which produces the matched alternatives.
这个条件如第35行所示,其中,如果在一段连续的时间内对该列排序,并且以前的排序方向为升序,那么它必须切换为降序排序。
This condition is shown in line 35, where if the column is being sorted for a consecutive time and the previous direction was upward, it must be switched to downward sorting.
按照典型的星型数据库设计,一个事实表包含按产品、地区和时间段排序的销售数据。
Using a typical star schema database design, a fact table might contain sales data by product, region, and time period.
OK, what I would like you to see is I've been printing out, as I went along, actually let's back up slightly and look at the code. There's merge sort.
好的,我想让你们看就是我运行过后,打印出来的结果,我们再回头看一下这段代码,这就是归并排序,输入一个列表。
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