创建数据库：

create database jylt

on (

name=jylt,

filename='e:\db\jylt.mdf',

size=4,

filegrowth=100%,

maxsize=1024

)

log on

(

name=jylt_log,

filename='e:\db\jylt_log.ldf',

size=4,

filegrowth=100%

)

go

1，增：insert into t_user values('wangpeng','19');s

2，删:delete from t_user where t_user.age<30

3，改:update t_user  name='xiaohong' where name='dahong'

4，查:select name as '名字' age as '年龄' from t_user where name='xiaohong'

check约束： age between 18 and 70 and gongzi 1000 and 3000

use master

go

create database jylt

on (

name=jylt,

filename='e:\db\jylt.mdf',

size=4,

filegrowth=100%,

maxsize=1024)

log on(

name=jylt_log,

filename='e:\db\jylt_log.ldf',

size=4,

filegrowth=100%)

go

use jylt

go

create table t_user

(

uid int primary key identity(1,1) not null,

ulname varchar(50) not null,

ulpwd varchar(50) not null,

unichen varchar(50) null,

uname varchar(50) null,

uaddress varchar(200) null,

usex int ,

utelephone varchar(50) null,

uhomepage varchar(200) null,

uimageurl varchar(200) null,

usignature varchar(200) null

)

go

create table t_reply

(

rid int not null primary key,

uid int foreign key references t_user(uid) ,

rtitle varchar(50),

rcontent varchar(max) not null,

rdatetime datetime default getdate()

)

go

create table t_board

(

bid int primary key not null,

bname varchar(50) not null,

bimgurl varchar(200) null,

binfo varchar(200) null

)

go

create table t_topic

(

tid int primary key not null,

ttitle varchar(50) not null,

tcontent varchar(max) not null,

tdatetime datetime default getdate(),

uid int foreign key references t_user(uid),

tview int default 0,

bid int references t_board(bid)

)

go