关于候选键和功能依赖性的问题 [英] question about candidate key and functional dependenccy

问题描述

Ok Sigh | ：感叹：



这可能是你们给我的最简单的答案我发现这个概念很难我想它只是没有点击



http://prntscr.com/3ps60e [^]



^表的图片我有一个疑问



i我试图在这个表中使用canidate键和函数依赖项：/我理解函数依赖是什么但是无法弄清楚它与这个表的关系如何实例



CookieCost = NumberOfBoxes X $ 5



i知道cookie的成本取决于盒子的数量



但我想如果你能告诉我答案，但更重要的是你如何得到我真的很感激

Ok Sigh | :sigh:

this is probably going to be the easiest answer you guys have ever given bit i am finding this concept difficult i guess it just isnt clicking

http://prntscr.com/3ps60e[^]

^picture of the table i have a question about

i am trying to fine the canidate key and the functional dependency in this table :/ i understand what a functional dependency is but cant figure out how it relates to this table for instance

CookieCost = NumberOfBoxes X $5

i know that cookie cost is functiolly dependent on the number of boxes

but yea i suppose if you could tell me the answer but more importantly HOW you got that i would REALLY appreciate it

推荐答案

5



i知道cookie的成本取决于盒子的数量



但是我想如果哟你可以告诉我答案但更重要的是你如何得到我真的很感激它

5

i know that cookie cost is functiolly dependent on the number of boxes

but yea i suppose if you could tell me the answer but more importantly HOW you got that i would REALLY appreciate it

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