MySQL数据库基本操作

show databases;
create database if not exists `HA`;
use HA;
create table if not exists student (id int, name char(40), age int);
show create table student \G;
desc student;
create table student2 (id int(20), name char(40), age int) ENGINE=InnoDB DEFAULT CHARSET=utf8;
show columns from student2;
drop table student2;
alter table student rename students;
show tables;
alter table students modify id int(10);
show fields from students;
alter table students modify id int(20) primary key;
show fields from students;
alter table students change name stname char(20);
desc students;
alter table students add sex enum(‘M‘,‘W‘);
desc students;
alter table students add uid int(10) first;
desc students;
alter table students add address char(50) after age;
desc students;
alter table students drop address;
insert into students values(1,1,‘liqiang‘,22,‘M‘);
insert into students(uid,id) values(2,2);
select * from students;
select uid,id from students;
select * from HA.students \G;
show tables;
drop table if exists students;
show tables;
show databases;
drop database if exists `HA`;
show databases;