外部索引键条件约束可让您在父、子资料表之间定义参考整合性。

A foreign key constraint allows you to define referential integrity between a parent and child table.

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外部索引键条件约束可于父资料表和子资料表之间，实作参考完整性。

A foreign key constraint can implement referential integrity between parent and child tables.

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您必须了解在产生的资料集程序码中，如何建立资料库中的外部索引键条件约束和串联行为。

It is important to understand how foreign-key constraints and cascading behavior in the database are created in the generated dataset code.

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So the point is, this balance between energy thatyou could think of as say bond energies in chemical reactions, and entropy that you can think of in terms of disorder, how many different possible combinations or configurations of something wrong, will dictate where the equilibrium lies.

关键在于，这种能量与熵之间的平衡,确定了平衡的条件，在化学中能量涉及键能，而熵和无序有关,即有多少可能的不同组合或者形位，二者的平衡会告诉我们平衡态是什么样子。

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