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The following content is excerpted from database solutions. Second Edition Key success factors in Database Design: The following guidelines are important for successful Database Design: · Communicate with users as much as possible · Use a structured methodology throughout th
publishing U. S., 2001] database design is the primary and basic content in the development of database application systems. Databases are the core and foundation of information systems. It organizes a large amount of data in the information system according to a certain model, It provides the function of storing, maintaining, and retrieving data. It is convenie
Label:relational database design for developersDirectory The origin of a Codd RDBMS12 law--rdbms Design phase of two-relational database Three design principles Four naming rules Database desi
possible.2.4 Design2.4.1 ParadigmIf there is no performance necessary reason, should use the relational database theory, achieves the high paradigm, avoids the data redundancy, but if in the data quantity and the performance does not have the special request, considers the realization convenience to have the appropriate data redundancy, But basically to reach 3NF. If necessary, avoid the practice of storing multiple flags in a field. A value of 11101
and Report Builder scripts. Say I usually create a report if I have to use an SQL like expression because the Case Number field cannot be decomposed into Year, serial number, case type and defendant code, and other elements. Performance can also go bad. If the year and type words Segments can be broken down into indexed fields. Then these reports will run much faster. -rdelval 4. Key Design 4 principle · Creates a foreign key for the associated field
Label:DirectoryThe origin of a Codd RDBMS12 law--rdbms Design phase of two-relational database Three design principles Four naming rules Database design, a cornerstone of the success of a software project. Many practitioners agree that d
Label:Transferred from: http://www.cnblogs.com/MeteorSeed/archive/2013/03/27/2880054.html ------------------------------------------------------------------------------------- Directory The origin of a Codd RDBMS12 law--rdbms Design phase of two-relational database Three design principles Four naming rules Database
Abstract This article mainly analyzes the ORACLE system structure and working mechanism from four different levels of Adjustment Analysis in the ORACLE environment of a large database, the optimization and adjustment schemes for ORACLE databases are summarized in nine different aspects.Key words: ORACLE database environment Adjustment Optimization Design SchemeTh
logical design is related to the logical data model of DBMS, so another input is the characteristic of DBMS. The logical model should meet the requirements of database storage, consistency, and Operation of all aspects of the user. The final is our physical
Tags: mysql database stored procedure trigger MySQL database permissions database design three major paradigmsA. MySQL stored procedure1. Concept: SQL statement with logic, there is no condition in the previous SQL statement, no loop, the stored procedure with the Process Control statements.2. Features:(1) Execution ef
1. Data Tables with tree relationships Many programmers have encountered tree-based data during database design. For example, a common category table, that is, a large category, contains several sub-classes, some sub-classes have sub-classes. When the category is not determined, you want to add a new subclass under any category, or delete a category and all its subclasses, and the number of them is expected
MySQL database design specifications and mysql design specificationsReprinted by songdeyouxiang 1. Database naming rulesIt consists of 26 English letters (case sensitive) and 0-9 Natural Numbers (not frequently needed) with an underscore;The name must be concise and clear (the name cannot exceed 30 characters );For exa
High-quality code design patterns for large. NET ERP Systems1 Cached cacheIn the system, a large number of cache design patterns are used to cache the data unchanged after the system is logged in, and not read directly from the database. Consuming some memory is much more cost-effective than reading data again from SQL Server. The basic
Introduction Oracle is the most widely used large-scale database management system. It improves the operating efficiency of the Oracle database system and is the prerequisite and guarantee for the efficient operation of the entire computer information system. There are many factors that affect the performance of Oracle database application systems, including both
(because it has no descendants), but must have a foreign key (because it has a father).The design of primary key and foreign key plays an important role in the design of global database. When the global database was designed, a U.S. database
inheritance ). 68. Integrity constaints: prevents data inconsistency constraints in the database. 69. IS-A hierarchy (IS-A hierarchy): type hierarchy ). 70. Local Logical Data Model (local Logical Data Model): a data model that represents a combination of a specific user view or user view. 71. logical
inconsistency constraints in the database.69. IS-A hierarchy (IS-A hierarchy): type hierarchy ).70. Local Logical Data Model (local Logical Data Model): a data model that represents a combination of a specific user view or user view.71. logical database
Basic Steps for Database Design (1) Demand analysis stage: requirement collection and analysis, and data dictionary and data flow diagram are obtained. (2) conceptual structure design stage: the user needs comprehensive, induction and abstract, the formation of conceptual model, expressed by E-R diagram. (3) Logical St
system analysts, database analysts, and users, determine the objects to be included in the system model, such as departments, employees, managers, and various business rules in the personnel and wage management system. After searching for business rules, determine the business rules to be used as database integrity and classify the business rules. The integrity design
Database Design Skills and database skills 1. Relationship between original documents and entities It can be a one-to-one, one-to-many, and many-to-many relationship. In general, they are a one-to-one relationship: an original document corresponds to only one entity. In special circumstances, they may be one-to-many or many-to-one relationships, that is, one ori
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