Abstract: In China ancient times in currency history, down to all the money copper steel turtle shell and so on, separately has acted as the currencies, but, looked from the entire currency history development's general trend, Song Yuan before the copper is the most main coin material, but after Song Yuan, the silver becomes the principal currency gradually, the copper cash and the silver coordinates. A Song Yuan time, becomes in the Chinese currency history the silver monetization crucial phase. Taking this into consideration, the academic circle has conducted various research to the Song Yuan time silver monetization question, has obtained a series of important achievements. However, in the north silk road trade and the silver monetization's relational aspect, not yet reaches the consensus until now. Author bold mean, plans to make a preliminary discussion in light of this, asks respectfully to point out mistakes.
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Create a Relational DAS instance: an important aspect of creating the Relational DAS is describing the database schema it should use.
创建一个关系型DAS实例：创建关系型DAS的一个重要方面是描述它应使用的数据库架构。
This article looks at a specific aspect of the integration of Perl tools with generic RDBMSs (relational database management systems) : embedding Perl in the database tables.
本文从一个特别的角度研究了Perl工具与普通rdbms(关系数据库管理系统，relational database management systems)的集成：在数据库表中嵌入Perl。
Due to their importance in relational databases, Primary keys are the most fundamental aspect of all keys and constraints.
由于其在关系型数据库中的重要性，主键是所有键和约束里最基础的方面。
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