paradigm paralysis

Label:Author: Dolphin Original address: http://blog.csdn.net/qingdujun/article/details/27365979 One, the first paradigm 1NF Requirements: Each component must be a non-divided data item. Characteristics: 1) has a primary key, and the primary key cannot be empty. 2) field can no longer be divided. Example: (The following example does not satisfy the first paradigm) /* Study Number age Information

Paradigm: The English name is the Normal Form, it is the British e.f.codd (relational database ancestor) in the 70 's to put forward a relational database model, the paradigm is the basis of relational database theory, but also we in the design of database structure process to follow the rules and guidance method. There are 8 types of patterns that can be found at present, in order: 1NF,2NF,3NF,BCNF,4NF,5NF

Tags: second normal company order discount delivery dependent design Disco simpleReprint http://blog.csdn.net/famousdt/article/details/6921622 Copyright belongs to the original author all Paradigm: The English name is the Normal Form, it is the British e.f.codd (relational database ancestor) in the 70 's to put forward a relational database model, the paradigm is the basis of relational database theory, but

Thomas. after Ku en proposed the paradigm of "Scientific Revolution", Robert Floyd in 1979 the year Turing Award uses the term programming paradigm. The programming paradigm generally includes three aspects: OOP For example: 1. logical system of a discipline, such as a class / objects, inheritance, dynamic binding, method rewriting, ob

After the addition of 10 PCs, if the Internet users can be less normal online, but if 10 computers together with the Internet, it can not be used. Unplug the network cable on the switch and plug it in again, and the computer will work properly. 10 computers are connected to each other by a single switch, and the original part of the old computer is connected to another switch, which is connected to the main switch, and the old and new computers are divided into two different network segm

the Internet services were affected, and 25th the night that there is a netizen explosion said Tencent server by the huge flow of hackers from around the world caused by hacker attacks QQ can not be landed, which led to the national network paralysis, More netizens in the major forums and chat groups have said that the network traffic congestion due to Sogou and Tencent input method a case. In addition, on the night of June 25, in addition to most o

Second, understanding database three paradigm, understanding database paradigm Understanding the database paradigm is of great help to design a rational database. Based on my understanding of the database paradigm and specific examples, this article attempts to understand the three

Label:about paradigm Normal Form paradigm is the basis of relational database theory, and it is also the rule and guidance method we should follow in designing database structure . The design paradigm of database is the specification that the database design needs to meet. Only by understanding the design paradigm of t

Paradigm: The English name is normal form, which is E. f. codd was summarized after the relational database model was proposed in the 1970s S. The paradigm is the basis of the relational database theory, it is also the rule and guiding method we should follow in designing the database structure. The design paradigm of databases is the specification that must be m

The procedure of the test interview (Database-paradigm) and the test paradigm 1> related concepts and knowledge Data Dependency: reflects the constraint relationship between internal attributes of a relationship. It is an abstraction of the association between real-world attributes and reflects the inherent nature and semantics of data. Standardization Theory: it is the basis for designing a good relations

Paradigm analysis, paradigm 1. the paradigm theory is a Codd method used for data modeling. Practice has proved that it is suitable for micro-analysis of a single link. It is better to use the later ER Method for macro analysis. In fact, the strength of ER analysis lies only in Macro Analysis. Sometimes the results cannot be guaranteed only by Using ER methods. R

Label: When designing the relational database, we should design a reasonable relational database to conform to different specifications, and the different norm requirements are called different paradigms, and the higher paradigm database redundancy is lower. But sometimes the pursuit of the paradigm to reduce redundancy, but will reduce the efficiency of data read and write, this time will be anti-

Functional Programming (1) Understanding of the "Programming Paradigm" and "functions", and the Function Recognition Programming Paradigm Programming paradigm) The programming paradigm refers to the idea and perspective of programming to solve the problem. It also determines the programmer's views on program running. M

Paradigm Theory, database Paradigm Theory Currently, relational databases have six paradigms: 1NF, 2NF, 3NF, 4nf, and 5NF ), the sixth paradigm (6NF ). The paradigm that meets the minimum requirements is the first paradigm. The second pa