CREATE TABLE t1(

   id int not null,

   name char(20)

);

创建表 

create table employee (employee_id char(6) primary key,name char(8),sex char(2),birthday(date);

create table products (product_id char(2) primary key, name char(20));

察看表结构 

describe employ-ee;

describe products;

向表中添加数据 

insert into employee values (’200301’,’zhangsan’,’m’,’1978/5/8’);

insert into employee values (’200302’,’lisi’,’f’,’1973/3/20’);

insert into employee values (’200303’,’wangwu’,’f’,’1970/10/9’);

insert into employee values (’200304’,’zhaoliu’,’m’,’1975/1/18’);

创建索引 

建表时创建带索引的表

1

create table test1 (test1_id char(4),name char(20), index idx_test1(name(10)));

2

create index idx_employee on employee(name); 用create为name列创建索引

3

alter table products add index idx_products(name); 用alter为name列创建索引

察看索引 

show index from employee;

show index from products;

删除索引 

1

drop index idx_employee on employee;

2

alter table products drop index idx_products;