避免死循环――第一部分 Alexander Kuznetsov原文：http://sqlblog.com/blogs/alexander_kuznetsov/archive/2009/04/20/avoiding-infinite-loops-part-one.aspx 尽......
There are several other ways to store hierarchies. Discussing them is beyond the scope of this post.
还有几种其它的方法来存储层级数据。讨论这些方法则超出了本文的范围。
存储层级数据请参考：
http://sqlblog.com/blogs/alexander_kuznetsov/archive/2008/08/24/store-your-configuration-settings-as-a-hierarchy-in-a-database.aspx
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