然而,这并非一定是代价最高的查询。
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。
Constructing an appropriate cost model has important effect on selecting a query plan.
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