数据库基本知识

create database s2015041--创建数据库
drop database XXXXXX--删除数据库
use master--使用master数据库
go--语句与语句的链接符号
create table abb
(
  code int not null,--列
  name varchar(50) not null,--列
  sex int,
  degree decimal(18,2) not null--列
)
  go
  insert into abb values(1,‘张三‘,0,99);
  insert into abb values(2,‘李四‘,1,79);--主键设置完成后需要保存后才能被识别，防止重复
  insert into abb(code,name,degree) values(4,‘王五‘,97);--指定列添加
  go
  select *from abb  --查询
  update abb set sex=1--修改所有的行中的sex列的值
  update abb set sex=1 where code=4--加where条件筛选修改code=3那一行的sex
  update abb set name=‘田七‘,sex=0,code=3,degree=99 where code=4
  delete from abb--删除所有数据
  delete from abb where code=1
  
  create table abc
  (
  no int primary key identity(1,1),
  name varchar(50) not null,
  sex varchar(50) not null,
  age int not null,
  high int not null,
  [weight] int not null,
  id int not null,
  [address] varchar(50)not null
  )
  go
insert into abc values(‘李四‘,‘男‘,18,173,75,37030319,‘亚特兰蒂斯‘)
insert into abc values(‘小二‘,‘女‘,21,163,60,37030319,‘远离一切之理想乡‘)
insert into abc values(‘王五‘,‘男‘,18,183,85,37030317,‘阿尔托利亚‘)
insert into abc values(‘蕾蕾‘,‘男‘,18,189,68,37039011,‘圣安地列斯‘)
insert into abc values(‘小黄‘,‘女‘,16,155,48,37099006,‘楼兰古国‘)
insert into abc values(‘小花‘,‘女‘,24,161,50,37099307,‘亚历山大‘)
 select *from abc
 delete from abc
update abc set name=‘张三‘ where name=‘李四‘;