Do they have a table for all categories and another for all sub-categories (and another for the sub-sub-categories and so on), or what? How do all the levels go around communicating with each other?Do they have a table for all categories and ano
阅读背景：
为Yelp或eBay（许多类别和子类别）等网站设计数据库和关系的最佳方法是什么？
来源：互联网
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