雪花中约束的意义 [英] Significance of Constraints in Snowflake

问题描述

Snowflake允许UNIQUE，PRIMARY KEY，FOREIGN KEY和NOT NULL约束，但我读到它仅强制执行NOT NULL约束.那么其他键的目的是什么，我们必须在什么情况下定义它们?我感谢任何例子.

Snowflake allows UNIQUE, PRIMARY KEY, FOREIGN KEY and NOT NULL constraints but I read that it enforces only NOT NULL constraint. Then what is the purpose of other keys and under what circumstances do we have to define them? I appreciate any examples.

谢谢你， Prashanth.

Thank you, Prashanth.

推荐答案

它们表达了意图，可以帮助人们理解您的数据模型.数据建模工具可以使用它们来生成图.您还可以通过编程方式访问它们，以自己验证数据完整性.

They express intent, helping people understand your data models. Data modeling tools can use them to generate diagrams. You can also programmatically access them to validate data integrity yourself.

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