问题描述
很抱歉，这是一个荒谬的问题；
Apologies if this is a ridiculous question;
我一直在高低寻找一个无济于事的答案。
I've searched high and low for an answer with no avail.
我知道如何计算最小覆盖率；
I know how to calculate minimal cover;
即确保每个功能依赖项在RHS上仅具有一个属性，
删除多余的/多余的通过计算检查所有FD的每个
的闭合来确定lhs属性，看看是否可以将其删除（再次通过计算闭合来计算）
ie ensure each functional dependency only has one attribute on the the RHS, remove extratraneous/redudant lhs attributes by calculating closure of each examining all FD's, seeing if any can be removed (again by calculating closure)
规范仅覆盖了另一个词
推荐答案
允许规范的覆盖在右侧具有多个属性。最低保障额不能。例如，规范封面可以是 A-> BC，而最小封面是 A-> B，A-> C。那是唯一的区别。
A canonical cover is "allowed" to have more than one attribute on the right hand side. A minimal cover cannot. As an example, the canonical cover may be "A -> BC" where the minimal cover would be "A -> B, A -> C". That is the only difference.
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