The optimizer relies on statistics to properly cost alternative query execution plans (QEPs) and choose the most optimal plan.

优化器是依靠统计信息来计算可选查询执行计划（QEP）的开销，同时选择出最优的计划。

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It is difficult to use the decision tree method to find the sub-optimal solution, not to mention the alternative ranking.

利用传统的决策树方法，无法确定一个次优方案，对所有方案进行排序也很难。

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You will find that alternative optimal solutions are possible.

你会发现选择最佳的解决方案是可行的。

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Yet while a combination between the two struggling automakers is not "optimal, " it is better than the alternative, she says.

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