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(From: http://www.itisedu.com/phrase/200604241410105.html) Design paradigm (Paradigm, database design paradigm, and database design paradigm) is a set of relational patterns at a certain level. Database construction must follow certain rules. In relational databases, this rule is a paradigm. The relationships in relational databases must meet certain requirement
The design paradigm (paradigm, database design paradigm, and database design paradigm) is a set of relational patterns at a certain level. Database construction must follow certain rules. In relational databases, this rule is a paradigm.The relationships in relational databases must meet certain requirements, that is, they must meet different paradigms. Currently
a column without duplicates.Description: In any relational database, the first normal form (1NF) is the basic requirement of the relational pattern, and the database that does not satisfy the first normal form (1NF) is not a relational database.For example, the following database
"Go" database paradigm 1NF 2NF 3NF BCNF (example) easy-to-understand explanationThis article on the majority of beginners database principles of the students is definitely a big benefit, haha, after the full reading of this blog post must be able to clearly understand the fo
Database paradigm 1nf 2nf 3nf bcnf (example)The design paradigm (paradigm, database design paradigm, and database design paradigm) is a set of relational patterns at a certain level. Database
Database paradigm 1nf 2nf 3nf bcnf (transfer) The design paradigm (paradigm, database design paradigm, and database design paradigm) is a set of relational patterns at a certain level.
Tags: primary key logic What to do 3nf dimension table language csdn existence subsetOriginal: http://josh-persistence.iteye.com/blog/2200644 First, the basic introduction 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 parad
The first paradigm (1NF ) columns with no DuplicatesFor example, the following database tables are in accordance with the first paradigm: Field 1 Field 2 Field 3 Field 4 Such database tables do not conform to the first paradigm: Field 1 Field 2 Field 3 Field 4 Fie
Tags: style http color strong data IO(Transferred from: http://www.itisedu.com/phrase/200604241410105.html) design Paradigm ( Paradigm , database design paradigm, database design paradigm) is a collection of relational patterns that conform to a certain level. The construction database must follow certain rules. In a relational
Database paradigm 1nf 2nf 3nf bcnf (example) The design paradigm (paradigm, database design paradigm, and database design paradigm) is a set of relational patterns at a certain level. Database
Label: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
columns. Therefore, it is impossible for you to design a database that does not conform to the first paradigm in your existing DBMS.1.2 The second paradigm (2NF ) property is completely dependent on the primary key [elimination of partial child function dependencies]If the relationship pattern R is the first paradigm, and every non-primary property in R relies on a candidate key for R, then it is called a
Tags: using IO java strong data div CTI SP onthe third paradigm of database designRelationships in a relational database must meet certain requirements. Meet different levels of requirements for different paradigms. The design paradigm of database is the specification that the database design needs to meet. Only by und
Label:There are 8 types of patterns that can be found at present, in order: 1NF,2NF,3NF,BCNF,4NF,5NF,DKNF,6NF. It is usually used in the first three paradigms, namely: primary paradigm (1NF), second Normal (2NF), and third Normal (3NF
"store item ID" and "quantity" information is deleted, and the "Warehouse ID" and "Administrator ID" information are also deleted. (2) Insert exception: You cannot assign an administrator to a warehouse when no items are stored in the warehouse. (3) Update exception: If the warehouse has been replaced by an administrator, the administrator ID for all rows in the table is modified. The higher the application's paradigm level, the more tables. There are many problems with the tabl
1.1NF means that each variable in the relationship is not re-divided2.2NF refers to a partially dependent 1NF elimination of the non-primary attribute pair code (candidate key)For example (s#,c#), SN, (s#,c#), SD. S#->SD so the SD part depends on the candidate key, not 2NF, only can be 1NF; decomposition to SC (s#, C #, G) and S_SD (S#,sn,sd,dean) is 2NF3. Bcnf r
;sid the presence of keywords determines keywords) SID (Warehouse ID) GOODSID (Product ID) MID (Admin id) Goodsnum (number of items) 001 20170510 1 200 Complies with BCNF Storehouseid (Warehouse ID) GOODSID (Product ID) Goodsnum (number of items) 001 20130104 200 Storehouseid (Warehouse ID) ManagerID (Administrator ID) 001
1nf-> 2nf: removes some function dependencies of non-primary attributes on codes.2nf-> 3nf: removes the function dependency on code passing by non-primary attributes3nf-> bcnf: removes the part and function dependency of the primary attribute on the code.Example: The following dependencies are full function dependencie
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