This has several implications for the design of a query language.
这对查询语言的设计具有多种含意。
The query has a WHERE clause that will only fetch the most recent values.
这个查询有一个WHERE 子句，用于过滤出最近的值。
JPA also has a fully functional query language that can work against an object model.
JPA还拥有可以用于对象模型的全功能查询语言。
A query is often slow because it has no index or an inefficient index.
查询很慢，因为没有索引或者索引不足够。
Constructing an appropriate cost model has important effect on selecting a query plan.
构造一个合适的代价模型对查询计划的选择有着十分重要的影响。
Constructing an appropriate cost model has important effect on selecting a query plan.
构造一个合适的代价模型对查询计划的选择有着十分重要的影响。
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