MySql学习--第一天

采用navicat客户端

1.建立数据库demo

CREATE DATABASE demo;

2.删除数据库demo

DROP DATABASE demo;

3.建立数据库后能够查看mysql数据库中的数据库

SHOW DATABASES;

4.建立数据库后，指定demo数据库

USE demo;

5.在数据库demo中，建立student表

CREATE TABLE student(
id int unsigned primary key,
name VARCHAR(20) not null,
sex char(1) not null,
birthday DATE not null,
tel char(11) not null,
remark VARCHAR(200)
);

6.向student表插入一条数据

INSERT INTO student VALUES(1,"李强","男","1995-05-15","13312345678",null);

7.向student表添加字段

ALTER TABLE student
ADD address VARCHAR(200) NOT NULL,
ADD home_tel CHAR(11) NOT NULL;

8.修改字段类型和约束

ALTER TABLE student MODIFY home_tel VARCHAR(20) NOT NULL;

9.修改字段名称

ALTER TABLE student CHANGE address home_address VARCHAR(200) NOT NULL;

10.删除字段

ALTER TABLE student DROP home_tel;