创建表

create table student(
name varchar(30),
id int,
score double,
classmate varchar(10)

);

查询数据

select * from user;

插入条数据

insert into user (name,pwd)
values (‘小张’,‘999’);

修改数据

update user set pwd=‘5555’ where name=‘小红’;

删除数据

delete from user where name=‘小张’;