下面是sql server中創建數據庫，創建數據表以及添加約束的sql語句：

use master --創建數據庫 if exists (select * from sysdatabases where name = 'jobtest')drop database jobtest create database jobtest on (name='jobtest_data',filename = 'D:\DB\jobtest_data.mdf',size = 10MB,filegrowth = 10% ) log on (name = 'jobtest_log',filename = 'D:\DB\jobtest_log.ldf',size = 10MB,maxsize = 20MB,filegrowth = 1MB ) go--創建student表 if exists (select * from sysobjects where name = 'student') drop table student create table student (id int not null,name varchar(50) not null,age int not null )go --創建grade表 if exists (select * from sysobjects where name = 'grade') drop table grade create table grade (id int not null,gname varchar(50) not null ) --添加約束 --主鍵 alter table student add constraint pksid primary key (id) --唯一約束 alter table student add constraint ukid unique(id) --默認約束 alter table student add constraint df_name default('張三') for name --檢查約束 alter table student add constraint ck_age check (age>0 and age<100) --必須給另一個表添加主鍵 alter table grade add constraint pkid primary key (id)--外鍵約束 alter table student add constraint fkgid foreign key (id) references grade (id)

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