mysql 建表，插入数据，建立索引，删除索引

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 employee;

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

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

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

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

drop index idx_employee on employee;

alter table products drop index idx_products;

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