数据库学习笔记（一）

//主键
create table department
(
    dept_id int primary key,
    dept_name nvarchar(100) not null,
    dept_address nvarchar(100)
)

//外键
create table employee
(
    emp_id int constraint pk_emp_id primary key,
    emp_name nvarchar(20) not null,
    emp_sex nchar(1),
    dept_id int constraint fk_dept_id foreign key references department(dept_id)
)

create table student
(
    stu_id int primary key,
    stu_sal int check (stu_sal>=1000 and stu_sal<=8000)
)

insert into student values(1,2000)