存储和继承的关系
Stored and Inherited Relations
摘要：
普遍应用的Codd的关系模型有两个结构：一个存储关系，只存储属性;一个视图，只存储继承的属性。1992年，我们提出了第三种结构，混合了两种类型的属性。实例表明这一想法很有吸引力。然而，没有人跟着。我们现在重新审议我们的提案。我们表明，一个关系数据库计划也使用我们的结构可能更忠实于现实。它可以将逻辑导航或复杂的值表达式留给查询。它还可以避免目前在实践中经常需要的辅助视图。迟做总比不做好，现有的DBS应该很容易适应我们的建议，几乎没有存储和处理开销。
英文摘要：
The universally applied Codd's relational model has two constructs: a stored relation, with stored attributes only and a view, only with the inherited ones. In 1992, we have proposed third construct, mixing both types of attributes. Examples showed the idea attractive. No one followed however. We now revisit our proposal. We show that a relational database scheme using also our construct may be more faithful to reality. It may spare the logical navigation or complex value expressions to queries. It may also avoid auxiliary views, often necessary in practice at present. Better late than never, existing DBSs should easily accommodate our proposal, with almost no storage and processing overhead.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
