database design books

I. Introduction of relational database design paradigm 1.1 First normal form (1NF) no duplicate columns The so-called first normal form (1NF) means that each column of a database table is an indivisible basic data item and cannot have multiple values in the same column, that is, an attribute in an entity cannot have more than one value or cannot have duplicate a

scripts and database design documents] In addition, add the following technical issues:Problem: Some netizens reported that the time field was missing when MySql guided Sqlite. After local testing, we found that it was indeed gone. After multi-party verification, we found that the time field exists in mysql and is not available in other databases. Therefore, this is generally not used in cross-

name, book author and so on. But such design, will give follow-up maintenance brought a lot of trouble. If the following books are published, it is necessary to add author information for each published book, which will undoubtedly add additional storage space and increase the length of the record. And if the author's situation changes, if the address has changed, you will need to change the record of eac

Good habits of database design and use, good habits of Database Design Good habits need to be constantly cultivated and strengthened until they become a habit and then part of their thoughts. Before or after work, I want to read "three character classics" or "Di Zigui" for my little guy whenever I have time. He may not

Three major paradigms of database design and three major paradigms of Database Design In order to establish a database with low redundancy and reasonable structure, certain rules must be followed when designing the database. In re

Label: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. A paradigm is a summary of a design requirement. In order to design a relational

In fact, I have been preparing the basic materials for another blog post, but I chatted with my friends and asked me what I was doing recently. I said I was working on the System Log Module, after talking with him, this blog came into being. My blog directory: Index writing plan All data can be expressed as follows: ID, table name, column name, and value For example, there is a data entry into the user table: ID (guid, int for ease of understanding) Username Password Email

. In general, database design tools do not recognize many-to-many relationships, but canRita to many relationships.Example 3: In "Library information System", "book" is an entity, "reader" is also an entity. The relationship between the two entities is aA typical many-to-many relationship: A book can be borrowed by multiple readers at different times, and a reader can borrow more

ArticleDirectory 1. What are the problems caused by poor database design? 2. Example scenario 3. Summary 1. What are the problems caused by poor database design? In the conceptual design stage of the database, different

Simple database design and use (FMDB), database design fmdb There is a need: m users share n files, one user may use multiple files, one file may be used by multiple users; if a user leaves, this user will no longer use any files. If a file is not used by any user, the user will delete the file. When a user is known

Last release: CYQ. DBImport V1.0 Introduction: CYQ. DBImport reverse engineering and batch import database tool V1.0 This release of V2.0 is intended for overseas attacks. The following is a description of this release. I. Introduction to new features of Version 2.0 1: fixed the GUID script error. 2: add processing. When the table for data import has no data, the table structure is also created. The original version needs to be manually created. 3

A simple database design example and a simple database design example An example of database design in a simple management system, including design tables, ergraphs, modeling, and scri

Change to a single record of historical data: Common Database Design (2) -- change to a single record of historical data problems 1. Overview There is a type of data stored in the historical customer operation data, such as the bidding documents, the refining scheme list, the price change of the product price, and the change list. Such historical data includes a mainstream water meter that controls the fl

development, and code to write access data. Review-The process of assessing whether or not to reach the final goal. Most projects overlook this stage because it takes too long and raises little interest: testing, documenting, and accomplishing things that you don't want to do, but that you have to do. At this stage, there should be a way to take advantage of user feedback and maintain a plan to change all issues. In the process of user usage, users are very rarely interested in the raw data o

Tags: Microsoft Difference Detail Related entity HTTP Contact process BSP21. Conceptual Design 1.1 key knowledge of conceptual design 1.2 Discrimination 　　The difference between an entity and an attribute: ① entities can be further described by multiple attributes, but not attributes, which are non-subdivided/segmented atoms. There is a connection between the ② entity or multiple entities, and the attribu

Abstract: The database is the foundation of the system. If you need to change the fields of the database frequently, or even modify the table and table relationship, I believe that no one will be able to cope with it several times! Because of the changes in the database structure, not only the changes in the database

relationship. A many-to-many relationship requires two references and another table. For more information about database design, see Designing a database. To learn more about PowerDesigner, click Help on the PowerDesigner main window toolbar to access the following three books: PowerDesigner General Features Guide, Po

. A many-to-many relationship requires two references and another table. For more information about database design, see Designing a database. To learn more about PowerDesigner, click Help on the PowerDesigner main window toolbar to access the following three books: PowerDesigner General Features Guide, PowerDesigner P

The task assigned by the teacher, let's create a database table for the personnel management project of a province to express which organizations have positions and who are not on duty. The information should be imported into excel data. when a tag is transferred out, it also indicates where it is to be transferred or when a new person is required to enter. if this person disappears, it needs to be deregistered. statistics should be made to determine

used with the price, the prices are used cost, the link with the URL, the image with the image, points with point, record log with records, configuration with config, State with status, pattern mode with mode, classification are unified with category, class type unified with type, factory with factory, orders with order, users with user, admin with admin, password Password, comment Notes are used remark, Article article, news, imports with import, export with export, enable enabled, whether it