... Process Design Language 过程设计语言 Push-Down List 下推表，后进先出表 Patent Document Management 专利文献管理系统 ...
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pdl什么意思_有道词典 ... PDL ProcedureDefinitionLanguage 过程定义语言 PDL Push Down List 下推表 PdH-PdL 压差 ...
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... push down list 后进先出表; 下推表 push down memory 后进选出存储器; 下推存储器后进先出存储器 push down method 函数下移; 下移方法 ...
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索引下推只需要事实表的单列索引，虽然在所需的外键列是索引的第一个键的情况下可以使用多列索引。
Index push-downs require only a single-column index on the fact table, although they can use a multi-column index if the required foreign-key column is the first key in the index.
如果只有几行从维度行中被选出，这样就只有几个键被下推，然后事实表的行数可能也会相应地减少。
If only a few rows are selected from the dimension table so that only a few keys are pushed down, then rows of the fact table might be reduced proportionally.
如这个查询计划所示，不止一个散列表的键可以被下推来过滤事实表的行。
As this query plan shows, keys from more than one hash table build can be pushed down to filter rows of the fact table.
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