Three important conceptions-function dependence, normalization and dissolution of data scheme-are analysed. Their directive action for design of relational data model is pointed out as well.

避开复杂繁琐的数学推导，分析了关系数据库理论中的函数依赖，数据模式的规范化及其分解这三个重要概念，指出了它们对关系数据模型设计的指导作用。

youdao

A "business policy" then, is a type of business directive that expresses the course of action that the business wants to have happen within a set of business conditions.

“业务策略”是一种业务指示，表述在一组业务条件下企业希望发生的行动过程。

youdao

Here is the second version of the directive in action.

下面是指令操作演示的第二版。

youdao

It's a mystery to me what he plans to do with the young undocumented students currently covered by the Obama administration's deferred action directive, which halts their deportation.

CNN: To woo Latinos, Romney needs specifics

Our focus right now and the President's focus is on the timely completion of that review and to implement his directive for corrective action as quickly as possible.

WHITEHOUSE: Press Briefing on Security Review

The action supported the directive.

FORBES: Four Big Management Lessons From Hurricane Sandy