What are the ways that you use to model and retrieve hierarchical info in a database?
推荐答案
关于这个主题的决定性文章是由 Joe Celko 编写的，他已经将其中的一些编入了一本名为 Joe Celko 的 SQL 中的树和层次结构的书中聪明人.
The definitive pieces on this subject have been written by Joe Celko, and he has worked a number of them into a book called Joe Celko's Trees and Hierarchies in SQL for Smarties.
他喜欢一种称为有向图的技术.可以在 这里
He favours a technique called directed graphs. An introduction to his work on this subject can be found here
