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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.假设一个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?
外键还有其他用途吗?我在这里遗漏了什么吗?
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强制执行参照完整性.它们还提高了性能，因为它们通常默认被编入索引.
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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