文章基于从面向对象数据库(OODB)到关系数据库(rdb)的模式转换，提出了一种从面向对象数据库查询到关系数据库查询的转换算法。
In this paper, based on a schema translation from Object-Oriented Database (OODB) to Relational Database (RDB), it proposes an algorithm for translating OODB query to RDB query.
讨论了关系数据库的空值与数据依赖满足性变换算法，并给出了有关的定义、规则、定理与变换算法。
The commutation algorithm toward null value for data dependent on satisfactory conditions in relational database is discussed and the related definitions, rules and theorems are put forward.
由于常规算法的局限性，在实际项目中换算外墙平均传热系数与外墙主墙体传热系数需要计算的工作量较大。
Then average heat transfer coefficient of building external wall and heat transfer coefficient of building block filling wall by calculating were calculated.
应用推荐