A database system
information_schema: virtual library, do not take up disk space and storage are some of the parameters of the database is started, as the user information table, column information, rights information, character information
performance_schema: MySQL 5.5 beginning a new database: mainly used for the collection database server performance parameters, record a variety of events that occur when processing a query request, lock phenomena
mysql: authorize, the main storage system user rights information
test database MySQL database system automatically created: test
Two to create the database
Syntax (help create database)
CREATE DATABASE database name of the charset utf8;
2 database naming rules:
May consist of letters, numbers, underscore, @, #, $
case sensitive
uniqueness
can not be used as create select keywords
can not be used alone digital
longest 128
Three database-related actions
1 View database Show Databases; Show the Create Database db1; the SELECT Database (); 2 Select the database USE database name 3 delete the database DROP DATABASE database name; 4 modify the database alter database db1 charset utf8;
A database system
information_schema: virtual library, do not take up disk space and storage are some of the parameters of the database is started, as the user information table, column information, rights information, character information
performance_schema: MySQL 5.5 beginning a new database: mainly used for the collection database server performance parameters, record a variety of events that occur when processing a query request, lock phenomena
mysql: authorize, the main storage system user rights information
test database MySQL database system automatically created: test
Two to create the database
Syntax (help create database)
CREATE DATABASE database name of the charset utf8;
2 database naming rules:
May consist of letters, numbers, underscore, @, #, $
case sensitive
uniqueness
can not be used as create select keywords
can not be used alone digital
longest 128
Three database-related actions
1 View database Show Databases; Show the Create Database db1; the SELECT Database (); 2 Select the database USE database name 3 delete the database DROP DATABASE database name; 4 modify the database alter database db1 charset utf8;