database table design best practices

1. Access Method: This step includes storing and retrieving records from files. 2. Alias (alias): Another name of an attribute. In SQL, you can replace the table name with an alias. 3. Alternate keys (backup key, ER/link model): no candidate key is selected as the master key in the entity/table. 4. anomalies (exception) See Update exception (update anomalies) 5. Application

1. Access Method: This step includes storing and retrieving records from files.2. Alias (alias): Another name of an attribute. In SQL, you can replace the table name with an alias.3. Alternate keys (backup key, ER/link model): no candidate key is selected as the master key in the entity/table.4. anomalies (exception) See Update exception (update anomalies)5. Application

Tags: jobs macwindowcontentsep atl database application plug-in feature Generation of database table design, generation of SQL statements, generation of database projects, generation of MySQL database First, training purposes

Label:database table structure Design specification-Briefly, why is it, because the main point of view is from the original public account of an article, slightly added some of their own views.Who is going to design the database?Certainly is the concrete development engineer to carry on, develops schoolmate's words, fi

Database table structure design methods and principlesAuthor: chanceyIn the current enterprise information system, the database is still the best way to store data. Although many books have guided us in database design, however, I

Tags: system bcnf actual application User ID Contact Instance exercise a person furtherThe concept of database system was learned at school, and was uniformly indefinitely, and remained at the definition and certification level. Recently in the project, seriously understand the next database paradigm problem, only the subconscious understanding of its principles and applications to quickly

Abstract: Database Design Principles: 1) Databases should not be designed for the entire system, but should be designed for the Services processed by each component according to the components in the system architecture; association between database tables corresponding to different components Minimize the number of external key associations required for tables o

Data Structure practices-circular double-stranded table applications and data structure practices This article focuses on the basic series of online courses on data structures (2): practical projects of linear tables. [Project-circular double-stranded table application]The non-empty linear

' (' user_id '), KEY ' Puidid_index ' (' puid ') ENGINE=InnoDBAUTO_INCREMENT=10DEFAULT Charset=utf8comment= ' Recruitment review sub-table 99 ' Due to the large amount of Comment table data, in advance to make a table, according to the post Puid divided into 100 sub-tables, then the current detail page involves SQL as follows: SELECT * FROM Wanted_post where

Tags: delete node get a point path length format model other Webhttp://mp.weixin.qq.com/s/a8klpzM5iam0_JYSw7-U4gWhen we design the database, whether it will break through the conventional, to find the most suitable for their own needs of the design, the following example: Commonly used adjacency table

Label: byLessHttp://blog.csdn.net/shendl The design of relational database table structure has the following two design techniques: The physical primary key, as the associated foreign key relational database, is composed of multiple data tables. The structure of each data

"Three major paradigms of database design"1. First normal form (1NF fromate): Each column (field) in the datasheet must be the smallest unit that cannot be split. That is to ensure the atomicity of each column.For example: UserInfo: ' Shandong province Yantai 13181621008 '=>userads: ' Yantai of Shandong Province '电话: ' 13181621008 '2. Second paradigm (2NF): After 1NF is satisfied, the requirement: all colum

(1) The database design should not be designed for the whole system, but should be based on the components of the system architecture, and the database design of the component unit for the business handled by each component; The association between the database tables corres

Label:Excellent articles for referenceDatabase (first paradigm, second paradigm, third paradigm) Database design is a serious, critical matter, a graduate, to join a large industry project, where senior engineers, there to teach me how the database is critical, sacred, unfathomable concept, so I have been with the eyes of worship. A few years ago, the project ma

attributes to be atomic and non-decomposed.The second paradigm: 2NF is a unique constraint on records, requiring records to have a unique identity, that is, the uniqueness of the entity;The third paradigm: 3NF is a constraint on field redundancy, that is, any field cannot be derived from another field, it requires no redundancy in the field. In fact, in the design of the database is the most we have to fol

Tags: identity performance L database font separation Convenient third paradigm Sam StatI. Aspects of database optimization inclusion Database optimization is a kind of comprehensive technology. There is not a way to improve the efficiency of the database very much. But through a variety of improvements. This makes the

The table content design cannot be modified. It is in the read-only Database $ db =$ _ SERVER ['document _ root']. "\ myfirst. mdb "; $ Connstr = "Driver = {Microsoft Access Driver (*. mdb)}; Dbq = $ db "; $ Connid = odbc_connect ($ connstr, "", "", SQL _CUR_USE_ODBC) or die ("failed to open the database! Contact the a

This paper first discusses the basic design of database table based on the third normal form, emphatically discusses the strategy and scheme of establishing primary key and index, and then summarizes the optimization scheme of database management system from the view of the expansion

1 Clothes Red X 100 1 Clothes Red XL 200 1 Clothes Red XLL 300 Query the sizes of red clothes select size from table where id={id} and color='red' and count > 0 We recommend that you go to the Internet to find articles and design methods on stock SKU. Item table: good_id, title, cate_id C

Tags: MySQL table optimizationOverview During the database design process, users may often encounter problems such as: 1. How long is the field in the table appropriate for this setting? 2. Should all tables be designed according to the third paradigm? optimizing the data type of a