Basic Introduction to MySQL database commands

The following articles mainly describe MySQL database commands in detail. We first begin by displaying the basic information of the MySQL database to parse the MySQL database commands in detail, the following describes the specific content of the article. Display MySQL basic information: MySQLstatus; view variable: showvariableslike % ver

The following articles mainly describe MySQL database commands in detail. We first begin by displaying the basic information of the MySQL database to parse the MySQL database commands in detail, the following describes the specific content of the article. Display MySQL basic information: MySQL status; view variable: showvariableslike '% ver

The following articles mainly describe MySQL database commands in detail. We first begin by displaying the basic information of the MySQL database to parse the MySQL database commands in detail, the following describes the specific content of the article.

Display basic MySQL information:

 
 

  
  
MySQL>status; 
 
 

View variables:

 
 

  
  
show variables like '%version%'; 
 
 

Backup and Restore MySQL database command:

1. Command for backing up MySQL database:

Run the following command in the lib directory of MySQL in cmd:

 
 

  
  
MySQLdump -hhostname -uusername -ppassword databaseName > backupfile.sql 
 
 

Example:

MySQLdump-hlocalhost-uroot-p123456 test> test. SQL

2. Export a table:

MySQLdump-u user name-p database name Table Name> exported file name

 
 

  
  
MySQLdump -u root -p dataname users> dataname_users.sql 
 
 

Command to restore the MySQL database of the MySQL database:

First, create a database: create database;

Then enter the database: use Database Name;

Then execute the SQL Script: MySQL> source d: \ aaa. SQL;

Complete

MySQL Database help Command: Enter MySQLdump-help in the lib directory

NOTE: If environment variables are configured, you can directly run them without entering lib.

Connect to MySQL

Run mysqld.exe in the mysqlinstallation directory to start the service.

Go to the MySQL Management page

MySQL-h localhost-u root-p

-H host name-u user name-p Password

Change the password.

Format: MySQLadmin-u username-p old password New password

MySQLadmin-u root-password ab12

Note: because the root account does not have a password at the beginning, the old-p password can be omitted.

Change the root password to 123456.

Show all databases

 
 

  
  
show databases; 
 
 

Create a new database

 
 

  
  
create database new; 
  
  
drop database if exists school; 
 
 

If SCHOOL exists, delete it.

Use this database

 
 

  
  
use new; 
 
 

MySQL database command: Create a new table

 
 

  
  
create table app_user( 
  
  
username varchar(20), 
  
  
password varchar(255), 
  
  
primary key(username)); 
 
 

Display table structure

 
 

  
  
describe app_user;/desc app_user; 
 
 

Show all tables

 
 

  
  
show tables; 
 
 

Insert Test Data

 
 

  
  
insert into app_user values('tomcat' , '123'); 
  
  
insert into app_user values('yeeku' , '123'); 
 
 

Exit MySQL Management Interface

 
 

  
  
exit/quit; 
 
 

The above content is an introduction to the basics of the MySQL database. I hope you will have some gains.