当前位置：网站首页>[introduction to MySQL] the first sentence · first time in the "database" Mainland

[introduction to MySQL] the first sentence · first time in the "database" Mainland

2022-07-06 17:43:00 【kikokingzz】

Write it at the front
Long time no see , I miss you so much ~ I've been busy cleaning the house recently , Prepare a small decoration , Build a small E-sports themed room , So lazy for a few days （ In fact, the articles written before have not been saved , Dropped the network and deleted it ~~~~(>_<)~~~~）. Okay , Without further ado , This time I plan to start writing about the basic knowledge of data analysis , In the future, the route planning for data analysis is also gradually planned , But about 【 database 】 This kind of content is certainly an indispensable basic knowledge reserve , therefore Students and leaders who are interested in data analysis can continue to pay attention to this column ！

Catalog

Write it at the front

Knowledge point 1： Database “ Basic personal information ”

1.1 Some concepts of database

1.1.1 The concept of databases

1.1.2 What is? SQL？

1.1.3 What is? MySQL？

1.1.4 Non relational and relational databases

Knowledge point 2： Database related software download tutorial

2.1 MySQL Equipment and use of

2.1.1 MySQL Download by hand

2.1.2 MySQL Handle installation

2.1.3 MySQL Hand to hand inspection

2.2 Navicat Equipment and use of

2.2.1 Navicat Download by hand

2.2.2 Navicat Handle installation

2.2.3 Navicat Hand to hand inspection

Knowledge point 1： Database “ Basic personal information ”

1.1 Some concepts of database
1.1.1 The concept of databases
Q1： What is a database ？
A1： database （database） Is a container for storing organized data , It collects and saves a large amount of data and processes them by computer , Efficient access . We often use database in our life , For example, we are in CSDN Mid search “ database ”, At this point, we are using the database ; When we log in CSDN when , Also rely on the database to verify the account and password .
Q2： What is database management system （DBMS）？
A2： Database is a term , Usually, the ones we use Database software should be called database management system （DBMS）. Database is through DBMS Containers created and manipulated , We have no direct access to the database , We use DBMS, It accesses the database for us .
Currently common database management software （DBMS） Yes ：
Oracle：Oracle Database, also called Oracle RDBMS, Or abbreviation Oracle. Oracle is a relational database management system . It is a leading product in the field of database .
Microsoft SQL Server：SQL Server It's a database management system developed by Microsoft , yes Web The most popular database for storing data on , It has been widely used in e-commerce 、 Bank 、 insurance 、 Power and other database related industries .
MySQL：MySQL Is the most popular open source SQL Database management system , It consists of MySQL AB Development 、 Release and support .MySQL AB It's a family based on MySQL The developer's business company , It's a second generation open source company that uses a successful business model to combine open source value and methodology .
DB2：DB2 It is mainly used in large application system , It has good scalability , Supports from mainframe to single user environments , Apply to all common server operating system platform .
Redis：redis It's a key-value The storage system . It supports storage value There are more types , Include string( character string )、list( Linked list )、set( aggregate )、zset(sorted set -- Ordered set ) and hash（ Hash type ）.
MongoDB：MongoDB Is a database based on distributed file storage . from C++ Language writing . For the purpose of WEB Applications provide scalable, high-performance data storage solutions .
1.1.2 What is? SQL？
SQL Structured query language （Structured Query Language） Abbreviation , Is a specialized language for communicating with databases ; It consists of very few words , It can be applied to almost all important DBMS, Very flexible .
Q1：SQL Is it completely portable ？
A1：SQL It is not a patent language , It has a Standards Committee , It attempts to define a variety of DBMS The use of SQL grammar , But any two DBMS Realized SQL Not exactly the same , Therefore, the syntax used in this column is aimed at MySQL Of , If used for other DBMS, Please be sure to go to its official website to consult the manual for learning .
1.1.3 What is? MySQL？
We store data 、 retrieval 、 Management and processing is done by the database management system （DBMS） This software completes ,MySQL It's based on “ The client — The server ” Of DBMS, It has the following advantages ：
The cost is zero ：MySQL Open source , So you can use it for free , Free modification .
Strong performance ： Small volume 、 Fast , Support multiple operating systems , The interface provided supports multiple language connection operations .
Easy to use ：MySQL Easy to install , And easy to use .
Q1： What is? “ The client —— The server ” Of DBMS？
A1：DBMS There are two main categories , One is based on a shared file system DBMS, The other is based on “ The client — The server ” Of DBMS, The main differences are as follows ：
Based on shared file system ： Its representative is Microsoft Access and FileMaker, Mainly used for desktop purposes , Usually not used in high-end or more critical applications .
be based on “ The client — The server ” Of ： Wen as his name , This kind of DBMS It is divided into client part and server part . The server part is a software responsible for all data access and processing , Only server software deals with data files , That is, the operations of adding, deleting, modifying and querying data are completed by the server software . The client part is the software that deals with users , As a “ Second biography ”, Submit the user's operation request to the server software through the network for processing , When the server finishes processing the request , Then it is passed to the user through the client software .
1.1.4 Non relational and relational databases
1、 Relational database
Relational database , Means the adoption of relational model To organize a database of data , It stores data in the form of rows and columns , To make it easy for users to understand , This series of rows and columns in a relational database is called a table , A group of watches make up database . Relational model can be simply understood as two-dimensional table model , A relational database consists of Two-dimensional table And the relationships between them constitute a data organization .
Typical representatives of relational databases are MySQL、Oracle、SQL Server etc. , It also has the following characteristics ：
Easy to understand . Logically similar to common tables .
High data consistency , High integrity , Low redundancy ; The low redundancy is shown in , When the above table 1 There is 100 Classes of students are 715 class , At this point we just need to look at the table 2 Record once in the class information form 715 Class teacher information is enough , There is no need to record the information of the head teacher for each student .
Mature technology , You can use complex operations such as external links .
2、 Non relational database
NoSQL, A general term for a non-relational database , They don't guarantee the ACID characteristic , That is, there is no guarantee that the data in the process of writing or updating the data Atomicity （ Or indivisibility ）、 Uniformity 、 Isolation, 、 persistence .
Q1： Why are there non relational databases ？
A1： With the Internet web2.0 The rise of websites , Traditional relational databases are dealing with web2.0 Website , Especially large scale and high concurrency SNS Type of web2.0 Pure dynamic website has appeared to be powerless , There are a lot of insurmountable problems , The non-relational database has developed rapidly due to its own characteristics .NoSQL The emergence of database is to solve the challenge of large data sets and multiple data types , Especially big data application problems .
Non relational database data storage ： Store key value pairs 、 file 、 Image and other data . Let's take key value pairs as an example ：
Typical examples of non relational databases are MongoDB、Redis etc. , It has the following characteristics ：
High query efficiency . For example, we need to query kiko Classmate teacher, We just need to find the one that contains kiko This student's record , This record contains kiko Of teacher Information , Directly available , Therefore, the query efficiency is very fast , We don't need to be like a relational database , You have to look in other data records .
It is easy to cause data redundancy . Empathy , If 715 Ben you 100 A classmate , If you use a non relational database , At this time, we need to record one in each student's record teacher Key value pairs of information , That is to record 100 Information of the second class teacher .

Knowledge point 2： Database related software download tutorial

2.1 MySQL Equipment and use of
2.1.1 MySQL Download by hand
step1. Click to enter MySQL Official website ：MySQL
step2. Click on 【DOWNLOADS】, Then click on the... At the bottom of the page 【MySQL Community Downloads】
step3. Enter the next page , Click on 【MySQL Installer for Windows】
step4. Select the large file below , And then click 【Download】 Start the download .
step5. Here, according to your own wishes , I won't log in , So click 【No thanks···】, Then the program starts downloading .

PS： Of course! , I also provide downloaded MySQL For everyone to use , You can send it in the official account 【MySQL download 】, You can get the network disk link ~
2.1.2 MySQL Handle installation
step1. As learning words , We click 【Server only】 that will do , And then click 【Next】.
step2. Click on 【Execute】 after , Start the service installation .
step3. Display installation complete , After that, click 【next】 Until you enter the authentication page .
step4. The authentication page is displayed , We operate in the following order .
step5. After setting the password, we kept clicking 【Next】 Default operation , Until it appears on the following page , Click on the 【Execute】 after , The following figure appears , The installation is successful .
2.1.3 MySQL Hand to hand inspection
To test our MySQL Is it installed correctly , Let's check it by following some operations ：
step1. open MySQL Command line page , And enter the password we set during installation , Now enter the welcome interface .
step2.MySQL It's a database management system , There is more than one database under this system , So we can use the following command to show MySQL The database of .
show databases;
step3. We can also create a database ourselves db1, This is achieved by the following command ：
create database db1;
Through the above basic operations , If they all work properly , It means that we download and install MySQL Have succeeded ！

I'm the divider

2.2 Navicat Equipment and use of
2.2.1 Navicat Download by hand
step1. Click the official website link ：Navicat for MySQL Price plan | Navicat The store
step2. Click to buy 【 Permanent license 】 edition , I suggest you to use it for learning , You can choose a non-commercial version to download
PS： Of course! , As a student party learning words , You can use the green version Navicat, You can reply in the official account below 【Navicat download 】, You can get the network disk link ！ Be careful , For learning purposes only , Commercial use must support genuine ！
2.2.2 Navicat Handle installation
About its specific installation tutorial , If you buy a genuine product, you can do it step by step , Installation of other versions , You can refer to the following tutorial for installation , Close test effectively ！
Navicat 16.0 Detailed installation tutorial https://mp.weixin.qq.com/s/bNVSRUEcpXiAe57hklDvDw
2.2.3 Navicat Hand to hand inspection
We test Navicat Whether it is installed normally , Is in the Navicat Middle link MySQL, The specific operation is as follows ：
step1. Click on 【 file 】 after , Click on MySQL Of 【 make new connection 】.
step2. Input installation MySQL The password set when , And then click 【 determine 】
step3. Check the left side to find Navicat Already connected to MySQL 了 .
Of course, we can also get through Navicat How to enter statements in , Number of query databases , To verify whether the connection is successful , Its operation is as follows ：
step 1： Click on 【 Inquire about 】, And then click 【 New query 】, Then a pop-up will pop up that allows you to enter MySQL Statement interface .
step 2： We enter show databases; after , Click on 【 function 】, You can see the running results .
Through the above operations, we can verify our Navicat It has been installed successfully ！