sql example 1 – create

• database 操作
  

  create dateabase test;
  use test;
  

  show databases;
  show create database test;
  drop database test;
  

  create database if not exists test;
  drop database test;
  

  create database if not exists test character set gbk;
  alter database test character set utf8;
  

• table 操作
  

  use test;
  create table user1 (
  id int not null,
  username varchar(20) not null
  );
  

  show tables;
  desc user1;
  show columns from user1;
  select * from user1;
  

  show create table user1;
  drop table user1;
  

  create table user1 (
  id int(11) NOT NULL,
  username varchar(20) NOT NULL
  ) ENGINE=InnoDB default charset=gtk;
  
  show create table user1;
  alter table user1 character set utf8;