online shopping database design

practice of database management systems. In 1985, Dr. Codd released 12 rules that clearly define the concept of a relational database as a guiding principle for the design of all relational database systems. Information Rules all information in a relational database is re

and expandable space. Most programmers do not have a clear understanding of the starting point of software development. They always think that implementing functions is important. After simply understanding the basic requirements, they will rush into the coding stage, there are few and relatively simple ideas about database design. Most designs only stay on the surface, which is often fatal and leaves many

the system, then, these structures are gradually subdivided into smaller units. In the database design, start the top-level step by identifying the relationship between the object and the data, and then gradually add details, such as the information about the object and the link you want to save (as an attribute) and all constraints on entities, relationships, and attributes. 128. Transaction: an action or

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 Design Program Design): a stage in th

The ORACLE tutorial is the design and development of the application database system on the Oracle platform. Oracle is currently the most widely used database system. A complete database system includes system hardware, operating system, network layer, DBMS (Database Managem

expressions.All necessary.-Vanduin. Chris. CJ 9. Creation ModeA chart is better than a thousand words: developers not only need to read and implement it, but also use it to help themselves talk to users.The mode helps improve the efficiency of collaboration, so that there is almost no big problem in the early database design. Mode is not requiredIt's complicated. You can even simply write it on a piece o

Tags: step without naming date business Mutual management system online Purpose: Effective storage, efficient access. Excellent design features Reduce data redundancy, 2. Avoid data anomalies, 3. Save storage space, 4. Efficient access to data Database design Steps1. Requirements analysis, 2

the user to order product informationAttributes (Order Number, recipient, phone number, address, product name and quantity, order status, payment status) Unique Identifier (Order Number) storage features (Table sharding) Shopping Cart module: used to save the items selected during user shoppingAttribute (number, user name, product number name quantity price, join time) Unique Identifier (shopping cart numb

Tags: database designDatabase design process and data description1. Requirements Analysis Phase (accurate understanding and analysis of user needs including data and processing)2. Conceptual structure design phase (to form an independent DBMS conceptual model by synthesizing, generalizing and abstracting the user's needs)3. Logical Structure

Steps for Database design① Demand Analysis② Logic DesignLogical modeling of a database using ER diagrams③ Physical Design④ Maintenance OptimizationA. New requirements for the building of a tableB. Index optimizationC. Large table splitting"Demand Analysis"① Understanding the data to be stored in the System (object/enti

converted to many-to-many relationships, you 'd better set them to many-to-many relationships at the beginning. Switching from the existing multi-to-one relationship to the multi-to-many relationship is much harder than the first one. 8) plan data retention and recovery Consider data retention policies and include them in the design process to design your data recovery process in advance. The data dictiona

Http://www.cnblogs.com/RunForLove/p/5693986.htmlThe three paradigms of database design: In order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a paradigm

Oracle is recognized as the most secure database system. Enterprise-level Oracle database application systems include system hardware, operating systems, network layers, and DBMS database management systems), applications, and data. Each part is mutually dependent, each part must be properly configured, designed, and optimized to achieve a high-performance

First, IntroductionUltra-large systems are characterized by:1. The number of users to deal with is generally more than million, and some more than tens of millions of data, the database generally more than 1TB;2. The system must provide real-time response function, the system needs to operate without downtime, requiring a high availability and scalability of the system.In order to meet the above requirements, in addition to the need for superior perfo

data redundancy. Second, the design of the commodity information table Assuming you are a developer at a department store computer, one day the boss asks you to develop an online E-commerce platform for the company, which has thousands of items for sale, but is currently only going to sell dozens of kinds of goods that are convenient to transport online, of c

be displayed by tree type list mostly adopt similar design. Some people may think that the type_father field in type_table_2 is redundant data and can be removed. In this case, when inserting or deleting a category, you have to make a tedious judgment on the content of the type_layer, so I have not deleted the type_father field, this is also in line with the principle of appropriately retaining redundant data in the

-many relationships at the beginning. Switching from the existing multi-to-one relationship to the multi-to-many relationship is much harder than the first one. 8) plan data retention and recovery Consider data retention policies and include them in the design process to design your data recovery process in advance. The data dictionary that can be released to users/developers is used for convenient data ide

length and number of digits of the type_layer according to user requirements, you can change the number of restricted layers and the number of sub-categories. In fact, the above design is not only used in the category table, some online forum programs that can be displayed by tree type list mostly adopt similar design. Some people may think that the type_father

appropriately retaining redundant data in the database design to reduce program complexity. I will introduce a case of intentionally increasing data redundancy. 　　II. design of commodity information tableAssume that you are an electronic brain developer of a department store. one day, the boss asks you to develop an online