创建数据库

create database 班级  --创建的班级的数据库 
go
use 班级  --使用班级这个数据库
go
--创建表
create table banji
(
code int,
name char(20),
sex char(20),
fenshu decimal(18,2),
shengao decimal(18,2),
tizhong decimal(18,2)
) 
go
--添加数据
insert into banji values(1,'刘影','男',100,180,80)
insert into banji values(2,'张德民','男',100,180,80)
insert into banji values(3,'马志杰','男',100,180,80)
insert into banji values(4,'马沁鑫','男',100,180,80)
insert into banji values(5,'高和平','男',100,180,80)
insert into banji values(6,'任东涛','男',100,180,80)
insert into banji values(7,'张欲隔','男',100,180,80)
insert into banji values(8,'齐鑫','男',100,180,80)
insert into banji values(9,'刘宏睿','男',100,180,80)
go
--查询语句
select*from banji 
--查询一列
select name from banji
--查询多列时，用逗号隔开
select name,sex from banji
--根据条件查询一行
select*from banji where code=2
--只更改code为1的人姓名的语句
update banji set name='刘颖' where code=1
--全部删除
delete from banji 
--删除code为5的语句
delete from banji where code=5