DDL operations database

DDL operations Database: Common CRUD operations

A, C (I create) to create

　　1. Create a database

create database database name;

　　2, create a database to determine whether there is, then create (if there is, it is no longer created)

 create database if not exists database name;

　　3, create a database and specify the character set

create database database name of the character set and character set;

　　Demo: Creating DB1 database to determine whether there is, and to develop character set is utf8;

create database if not exists db1 character set utf8;

 

Two, R (Retrieve) query

　　1, the names of all database queries

show databases;

　　2, query each database character sets: a database query creation statement

show create database database name;

 

Three, U (Update) modified

　　1, modify the database character set

alter database database name of the character set the character set names;

 

Four, D (Delete) Delete

　　1, delete the database

drop database database name;

　　2, the database to determine whether there exists then delete

database name drop database if exists;

　　

Fifth, use the database

　　1, query the database name currently in use

select database()

　　2, the use of database

use the database name