术语“基数”如何解释?与“关系”不同;在数据建模中?
您能否描述一下:术语“基数”与数据建模中的“关系”有何不同?
Can you describe: How does term 'cardinality' differs from 'relation' in data-modeling?
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它们是完全不同的概念(有点像问算术中的“加法”和“零”有什么区别),因此除了简单地建议查找它们的定义之外,很难解释任何“差异”。
They are completely different concepts (a bit like asking what's the difference between "addition" and "zero" in arithmetic), so it's difficult to explain any "difference" other than to simply suggest looking up their definitions.
基数与表列中值的出现率相关。而关系通过一个或多个字段定义两个表之间的链接。
不过同意马塞洛的观点。比较这两个术语就像比较苹果和橙子一样。
Cardinality relates the rate of occurrence of a value in a table column. Whereas relation defines link(s) between two tables through one or more fields.
Agree with Marcelo though. Comparing those two terms if like comparing apples and oranges.