By analyzing the standard theory of relational database and making use of the knowledge of the functional dependency and diagram,this article mainly discusses how to evaluate candidate keys to relational Database by using attribute closures and functional dependency diagrams.
通过对关系数据库规范化理论的研究,利用函数依赖和图论的有关知识,分别从属性闭包和函数依赖图的角度讨论了如何求解候选码,并给出了一些具体实例。
Oncclosure properties of PH-distribution in the continuous case;
关于连续型PH-分布封闭性质的探讨
Oncclosure properties of PH-distribution in the continuous case;
关于连续型PH-分布封闭性质的探讨
Heat and Mass Transfer Characteristics in the "Zeolite-Water" Closed Adsorption Cycle
“沸石-水”封闭吸附循环的传热传质特性
A Comparative Study of the Sealing Ability of Three Root Canal Sealers in Vitro;
三种根管封闭剂根尖封闭性能的比较
Scanning electron microscopic study on the penetration and adaptation of enameloplasty sealant technique(est)
窝沟封闭剂的封闭性的临床效果评价
Study on Restrictive Water Quality Parameters for Closed Recycling Water in the Recycled Fiber Mills
废纸造纸封闭循环水限制性水质参数研究
bounded naturally fractured reservoir
封闭式天然裂缝性储层
closed linear model of production
封闭式的线性生产模型
Experimental Study of Fibrin Sealant in Sealing Cystic Duct;
纤维蛋白封闭剂封闭胆囊管的实验性研究
The Effect of Dentin Cleaners on the Sealability of Dyract Composite;
牙本质清洁剂对Dyract复合体封闭性影响的实验研究及临床评价
TO SOLVE A NONLINEAR MODEL OF CONFINING STRATUM DOUBLING MEDIA WITH INTEGRAL TRANS- FORMATION
应用积分变换求解非线性封闭地层双重介质模型
Evaluation of the Coronal Seal in Roots Filled with three Root Canal Filling Material in Scanning Electron Microscope
粘结性树脂根充材料根管封闭质量的扫描电镜观察
The state of being enclosed in an oval, horny case.Used of an insect pupa.
封闭状态封闭在椭圆形角质壳内的状态。用于一虫蛹
Effects of sealing dentinal tubules by Er.Cr:YSGG:a laboratory investigation
Er.Cr:YSGG激光封闭牙本质小管的实验室研究
Occluding or tending to occlude.
封闭的封闭的或倾向于封闭的
The S(n)-closed and S(n)-θ-closed Properties of θ-complex
θ-复形的S(n)-闭性质及S(n)-θ-闭性质
The Properties of Closure of Reliability Calculation About Element IFRAt_o;
IFRAt_o元件关于可靠性运算的封闭性
The research of inter-subjectivity breaks the seal of possessive power of subject, reveals the foundation of translation and explains the rationality of creative treason in translation.
它打破了占有式主体的封闭性,揭示出翻译的本质在于交际,解释了“创造性叛逆”的合理性。
Deblocking Kinetics of Water-Solubility Blocked Isophorone Diisocyanate
水溶性封闭异氰酸酯单体的解封动力学