First knowledge of database

MySQL It's the best RDBMS(Relational Database Management System, Relational database management system )

Simple database commands ：

mysql -u user name  -p password ： Login data ,

select version（）; View the database version number

show databases ： View all local databases ;

user Database name ： Switch database ;

show tables; View all the table names under the database ;

exit ： sign out ;

create user ' user name '@'host' identified by ' password '; Create user

grant all Database name .* to ' user name '@'localhost' ： to grant authorization

Authorization can be selected select insert update drop create;

grant all on *.* to user name @localhost

revoke all on *.* user name @localhost;

drop user user name @'localhost';： Delete user ;

show databases： Check the existing database .

show create database Database name ： Look at a database

show create database Database name ： View a database character set

create database if not exists Database name ; Create a nonexistent database ;

create database if not exists Database name alter character set code Create a nonexistent database And specify the code

alter database Database name character set utf8; Modify database code

drop database Database name ： Delete database

create table Table name （） ： Create table

drop table Delete table

insert int Table name values（ data , data ,...）： Add data

update from Table name set Modifying data where Where data needs to be modified ;

delete form Table name where Where the data to be deleted ;

select xxx ： Write what you check