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] nvarchar(20) not null, sex char(2) not null, birthday datetime default GETDATE(),
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 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('张三','男','1982-6-9','23456789451','来自天津',1) insert into Student values('李四','男','1987-6-9','78945678945','安徽',4) insert into Student values('王五','男','1982-6-9','65987845651','大连',3) insert into Student values('赵六','男','1981-6-9','25487965423','湖南',5) insert into Student(name,sex,birthday,phone,tId) values('江七','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')