Entity–relationship model
使用Entity–relationship model可以描述非常多在计算机科学、实际生活中的问题。
wikipedia Entity–relationship model
wikipedia Cardinality (data modeling)
NOTE: Cardinality 的中文意思是“基数”
One-to-one relation model
wikipedia One-to-one (data model)
One-to-many relation model
wikipedia One-to-many (data model)
一对多关系使用有向图来表示就是一个节点与多个节点相邻，相邻节点都有边指向它。
Example
1、polymorphism 多态
2、race condition
3、对于单核CPU、支持multitask的OS，则多个process共享一个CPU，这也是一种one-to-many relation
4、thread共享process的resource
4、多个process共享computer resource。
many-to-many relation model
wikipedia Many-to-many (data model)
Example
一个典型的例子就是多核CPU
READING LIST
https://fmhelp.filemaker.com/help/18/fmp/en/index.html#page/FMP_Help/many-to-many-relationships.html
https://dzone.com/articles/how-to-handle-a-many-to-many-relationship-in-datab