Relational database management system of easyclick

EasyClick And Relational database management system

What is a relational database management system

Database management system （ Complete spelling of English ：Relational Database Management System, abbreviation RDBMS） It is a software system designed for managing relational database , If you want to use relational database, you need to install database management system , It's actually an application .

Relational database management system can be divided into :

• Relational database server software
• Relational database client software

Relational database server software :

Mainly responsible for managing different databases , And there will be a series of data files in each database , Data files are used to store data , In fact, a database is a collection of a series of data files .

Relational database client software :

Mainly responsible for communicating with relational database server software , Transmit data to or obtain data from the server .
Rendering of relational database management system :

explain :

1. User operation relational database client , Implementation of database related operations .
2. The relational database client uses the Internet SQL Language and relational database server for data communication
3. The relational database server manages different databases , Each database will have a series of data files , The data is stored in the data file , Each database can be understood as a folder .
   Through the above effect picture, we can know , If the database client and database server want to communicate, they need to use SQL
   Effect diagram of communication flow
   

SQL Introduce

SQL(Structured Query Language) Structured query language , It's a kind of operation RDBMS The language of the database . That is to say through SQL Can operate oracle,sql server,mysql,sqlite Such relational database .

SQL The function of is to realize the communication between database client and database server ,SQL Is the bridge of communication .

SQL Language is mainly divided into ：

• DQL： Data query language , Used to query data , Such as select
• DML： Data operation language , Add data 、 modify 、 Delete , Such as insert、update、delete
• TPL： Transaction language , To process a transaction , Include begin transaction、commit、rollback
• DCL： Data control language , Authorization and authority recovery , Such as grant、revoke
• DDL： Data definition language , Do database 、 Watch management, etc , Such as create、drop
  explain :
• For programmers , The focus is on the growth of data 、 Delete 、 Change 、 check , Must be good at writing DQL、DML, Be able to write DDL Complete the database 、 The operation of the table , Other operations such as TPL、DCL Understanding can .
• SQL The language is not case sensitive

summary

• Relational database management system is a software , It can manage different databases , If you want to operate the database, install the corresponding relational database management system software .
• SQL The function of is to realize the communication between database client and database server , It's like a communication bridge .

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