外键在数据库设计中真的有必要吗？ [英] Are foreign keys really necessary in a database design?

问题描述

据我所知，外键（FK）用于帮助程序员以正确的方式操作数据。假设程序员实际上已经以正确的方式这样做了，那么我们真的需要外键的概念吗？

As far as I know, foreign keys (FK) are used to aid the programmer to manipulate data in the correct way. Suppose a programmer is actually doing this in the right manner already, then do we really need the concept of foreign keys?

外键有没有其他用途？我在这里缺少一些东西？

Are there any other uses for foreign keys? Am I missing something here?

推荐答案

外键有助于在数据级别实现引用完整性。它们还可以提高性能，因为它们通常会默认为索引。

Foreign keys help enforce referential integrity at the data level. They also improve performance because they're normally indexed by default.

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