为了说明这一事实，不妨假定存在一个 内部最优 （ interior optimum ），那么对于所有的 Mmk ∈,和所有的Sts ∈,，下列等式
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显示了一个内部最优解 interior optimal solution
从性能的角度来看，这被认为是一个非常有效的联接操作，因为通过贯穿唯一索引的唯一访问扫描内部表的成本是最优的。
From the performance perspective, this is considered a very efficient join operation, because the cost for scanning the inner table is optimal via unique access through a unique index.
提高IT能力不再是关于在IT内部局部的处理过程最优化了。
Improving it capability is no longer about localized process optimization within it silos.
只有当经济体所运用的内部制度与外部环境、非正式制度相互适应时，才会发挥其最优状态并产生经济效益。
Only when the economy by the use of internal systems and external environment, the informal system of mutual accommodation, the only play to their optimal state and generate economic benefits.
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