1.创建campus数据库:create database campus;
2.展示mysql中的所有数据库:show databases;
3.使用数据库:use campus;
4.创建student表格:
create table student(
id integer primary key auto_increment,
name varchar(20),
age integer,
gender integer,
birthday datetime);
.增:
insert into student (name,age,gender,birthday)
values('小明',15,1,19981012122323);
删:
在student表中删除name=’小明’的所有记录
delete from student where name='小明'
删除数据库drop database campus;
删除表格drop table student;
改:在student表中将小明的年龄改为20
update student set age=20 where name='小明';
查:
查找student表中的所有记录:select * from student;
查找student表中的age=15的name记录:select name from student where age=15;
对表字段进行增删改查:
增加字段:alter table student add id int default 0;
删除字段:alter table student drop id;
修改字段属性:alter table student modify gender int default 0;
修改字段名称及属性:alter student change gender sex int default 1;