... 当n=2时,称该关系为二元关系(Binary relation) 为了加以区分,必须对每列起一个名字,称为属性(Attribute) 候选码(Candidate key) ...
基于6个网页-相关网页
他这样加以区分,是为了说明想缩短市场投放时间,可以降低外部质量,但是决不能降低内部质量。
He makes this distinction to note that while external quality can be lowered to shorten time-to-market, internal quality cannot.
在这里,是为了分析的目的而加以区分的。 不同职能的特征和相对的显著性在一个机构的历史上,此时和彼时是不同的;
The character and relative significance of the various functions differ from one time to another in the history of any organization, and between one organization and another.
应用推荐