在关系数据库规范化理论中，求解后选关键字和主属性一直是一个棘手的问题。
In normalization theory of relation database, finding candidate key and primary attribute is always a difficult problem.
在大多数以关系数据库为主题的书籍当中，都可以找到关于规范化的更详细的信息。
Further detailed information on normalization can be found in most books whose main subject is relational databases.
有时候，人们通过将文档节点映射成关系格式来设法把XML文档保存到规范化的关系数据库表中。
Sometimes people try to save XML documents into Normalized Relational Database tables by mapping the document nodes into Relational format.
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