解释 ERD
CategorySection-Category 关系和 CategorySection-Categorization 关系有什么区别?
- CategorySection-Category 有一个 箭头和一个黑点。
- CategorySection-分类有 两端各有一个箭头。
两者都应该是“有很多”关系,但该图使用不同的符号来表示这两种关系。
What's the difference between the CategorySection-Category relationship and the CategorySection-Categorization relationship?
- CategorySection-Category has an
arrowhead and a black dot. - CategorySection-Categorization has
an arrowhead on both ends.
Both are supposed to be "has many" relationships but this diagram uses a different symbol to represent these two relationships.
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这取决于您使用的符号,但通常是:
请注意,仅仅因为绘制了图表并不意味着它显示的关系是合理的,甚至是可能的。
It depends on tyhe notation you are using but typically:
Note that just because a diagram is drawn doesn't makes the relationships it shows sensible, or even possible.
两端的鱼尾纹表示多对多关系。
Crowfeet on both ends indicate a many-to-many relationship.
CategorySections,但一个CategorySection可以属于一个Category。
我认为它告诉你可以创建许多不同的分类来定义不同的类别,但类别部分可以在不同的类别(和分类)之间共享。
CategorySections, but one CategorySection can belong to one Category.
I think it tells someting like you can create many different categorizations that define different categories but categorysections can be shared among the different categories (and categorizations).