sql relational database tutorial

SQL Server is a relational database management system that was originally developed by the Microsoft,sybase and ashton-tate three companies and launched the first OS/2 version in 1988. After Windows NT was launched, Microsoft and Sybase went their

I learned a Chinese Database textbook six years ago, but at that time my mind was not enlightened, Or I lacked a perceptual knowledge about the content of the textbook, so I had no effect after learning it. Recently, to create a system with CMS, we

After the concept of database was put forward, several data models appeared successively. There are three kinds of basic data models: Hierarchical model system, network model system, and relational model system. The relationship model proposed in

I. Database rankings and trends 1.1 complete ranking Links: https://db-engines.com/en/rankingThis site lists all the database rankings, and you can see the type of database you belong to, and update it once a month. You can have a look when

PHP's YII framework uses database configuration and SQL Operations Examples tutorial, yii example Tutorial Database access (DAO)YII contains a data access layer (DAO) built on top of the PHP PDO. DAO provides a unified set of APIs for different

Index Understand the related tables. FOREIGN key JOIN and maintain referential integrity For some suggestions on joins, subquery VS. Linked table Query I found that there is a tutorial in the MySQL documentation, but the

SQL turning is a tool in the Quest Central software produced by Quest Corporation. Quest is an integrated, graphical, Cross-platform database management solution that can manage Oracle, DB2, and SQL Server databases simultaneously. Introduction to

Preface:This tutorial was intended to focus on introducing the SQL database. However, it says that there is already a lot of data-related knowledge. Simply write down the entire development process of the project. Due to the tight schedule, the

Tutorial on Database Configuration and SQL operations in the PHP Yii framework, and tutorial on yii instances Database Access (DAO)Yii contains a data access layer (DAO) built on php pdo ). DAO provides a unified set of APIS for different databases.

The construction of the database must follow certain rules. In a relational database, this rule is a paradigm. A paradigm is a collection of relational patterns that conform to a certain level. Relationships in relational databases must meet certain