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exec xp_cmdshell 'md E:\project'
--ÏÈÅжÏÊý¾Ý¿âÊÇ·ñ´æÔÚÈç¹û´æÔÚ¾Íɾ³ý
if exists(select * from sysdatabases where name='bbsDB')
drop database bbsDB
--´´½¨Êý¾Ý¿âÎļþ
create database bbsDB
--Ö÷Êý¾Ý¿âÎļþ
 on primary
(
 name='bbsDB_data',--ΪÖ÷ÒªÊý¾Ý¿âÎļþÃüÃû
 filename='E:\project\bbsDB_data.mdf',--Ö÷Êý¾Ý¿âÎļþµÄ·¾¶
 size=10mb--³õʼ´óС
)
log on(
--ÈÕÖ¾Îļþ
 name='bbsDB_log',
 filename='E:\project\bbsDB_log.ldf',
 size=3mb,
 maxsize=20mb--×î´óÔö³¤Á¿Îª
)
go
use bbsDB
drop table BBSUsers
create table BBSUsers(
 UID   int identity(1,1) primary key  not null,--±êʶÁÐ×ÔÔö³¤
 UName   varchar(15)  not null,--Óû§Ãû£¬êdzÆ
 UPassword  varchar(16)   not null,--ÃÜÂë²»ÄÜÉÙÓÚ6λÊýĬÈÏΪ£¨888888£©
 USex   bit    not null,--ÐÔ±ð1´ú±íÄР
 UEmail  varchar(20)       null, --µç×ÓÓʼþ±ØÐë°üº¬@ĬÈÏֵΪ£¨P@P.com£©
 UClass   int    not null,--Óû§µÄµÈ¼¶(1)
 UregDate datetime      null,--×¢²áÈÕÆÚ£¨×¢²áʱϵͳʱ¼ä£©
 Uremark  varchar(255)      null, --±¸×¢ÐÅÏ¢£¨±¸×¢£©
 Upoint  int   not null,--Óû§µÄ»ý·Ö£¬µãÊý£¨20£©
 UBirthday   datetime       null,--Óû§ÉúÈÕ
 Ustate  int       null--״̬£¨0ĬÈÏΪÀëÏߣ©
)
go
select UPassword from BBSUsers
alter table BBSUsers-- ΪÃÜÂëÌí¼Ó¼ì²éÔ¼Êø³¤¶È´óÓÚ=6µÄ³¤¶È
 add constraint CK_upassword check(len(UPassword)>=6)
alter table BBSUsers--ΪÃÜÂëÌí¼ÓĬÈÏÔ¼Êø(888888)
 add constraint DE_upassword default ('888888') for UPassword
alter table BBSUsers--Email¼ì²éÔ¼Êø@
 add constraint CK_uemail check (UEmail like '%@%')
alter table BBSUsers--ΪE-mailÌí¼ÓĬÈÏÔ¼ÊøP@P.com
 add constraint DE_uemail default('P@P.co


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