alter table Team

add

constraint UK_captainId unique(captainId)--唯一约束

go

insert into Team values("第一组",1)

insert into Team values("第二组",2)

insert into Team values("第三组",3)

insert into Team values("第四组",4)

insert into Team values("第五组",5)

insert into Student values("小强","男","1982-6-9","23456789451","来自河北",1)

insert into Student values("小昭","男","1987-6-9","78945678945","山东",4)

insert into Student values("小溪","男","1982-6-9","65987845651","抚顺",3)

insert into Student values("小怜","男","1981-6-9","25487965423","天津",5)

insert into Student(name,sex,birthday,phone,tId) values("李真","男","1984-6-9","25487965423",5)

select * from Team

select * from Student

if exists (select * from sysobjects where name="teacher")

drop table teacher

go

create table teacher

(

id int identity (1,1) primary key,

name varchar(20),

address varchar(20)

)

go

insert into teacher values("zhang","hubei")

insert into teacher values("wang","hubei")

insert into teacher values("li","hubei")

insert into teacher values("chen","hunan")

insert into teacher values("zhao","hunan")

insert into teacher values("tian","guangdong")

insert into teacher values("ma","guangdong")

insert into teacher values("chang","tianjin")

insert into teacher values("liang","beijing")

select * from teacher

select count(*),address from teacher group by address having address<>"hunan"

--按地址分组查询并用having字句筛选出地址不是‘hunan’的

EXEC sp_configure "xp_cmdshell", 0

GO

-- 还原当前功能（xp_cmdshell）的配置信息为初始状态.

RECONFIGURE

GO

EXEC sp_configure "show advanced options", 0

GO

-- 最后，还原当前高级选项的配置信息为初始状态

RECONFIGURE

GO

在SQL Server2005中用语句创建数据库和表：

具体示例如下：

use master

go

if exists (select * from sysdatabases where name="Study")

--判断Study数据库是否存在，如果是就进行删除

drop database Study

go

EXEC sp_configure "show advanced options", 1

GO

-- 更新当前高级选项的配置信息

RECONFIGURE

GO

EXEC sp_configure "xp_cmdshell", 1

GO

-- 更新当前功能（xp_cmdshell）的配置信息。

RECONFIGURE

GO

exec xp_cmdshell "mkdir D:data", NO_OUTPUT

--利用xp_cmdshell 命令创建文件夹，此存储过程的第一个参数为要执行的有效dos命令，第二个参数为是否输出返回信息。

go

create database Study--创建数据库

on primary

(

name="Study_data",--主数据文件的逻辑名

fileName="D:dataStudy_data.mdf",--主数据文件的物理名

size=10MB,--初始大小

 filegrowth=10% --增长率)

log on

(

name="Study_log",--日志文件的逻辑名

fileName="D:dataStudy_data.ldf",--日志文件的物理名

size=1MB,

maxsize=20MB,--最大大小

filegrowth=10%

)

go

use Study

go

if exists (select * from sysobjects where name="Student")--判断是否存在此表

drop table Student

go

create table Student

(

id int identity(1,1) primary key,--id自动编号，并设为主键

[name] varchar(20) not null,

sex char(2) not null,

birthday datetime not null,

phone char(11) not null,

remark text,

tId int not null,

age as datediff(yyyy,birthday,getdate())--计算列。

)

go

if exists (select * from sysobjects where name="Team")

drop table Team

go

create table Team

(

id int identity(1,1) primary key,

tName varchar(20) not null,

captainId int

)

go

alter table Student

add

constraint CH_sex check(sex in ("男","女")),--检查约束，性别必须是男或女

constraint CH_birthday check(birthday between "1950-01-01" and "1988-12-31"),

constraint CH_phone check(len(phone)=11),

constraint FK_tId foreign key(tId) references Team(id),--外键约束，引用Team表的主键

constraint DF_remark default("请在这里填写备注") for remark--默认约束，

go