然而，这并非一定是代价最高的查询。

This is not necessarily the most expensive query, however.

youdao

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.

youdao

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.

youdao