Sql 复制、身份、关系

high guyz我有一个简单的问题，但对于像我这样的新手来说真的很难 这是我的问题

我需要创建两个具有关系的表，但它表示只有一个标识 可以用于每个表，或者是否有其他方法可以使用外键复制其他表中的所有数据，而无需键入相同的数据？ 我们将感谢您的帮助（谢谢！）

试试这个：

create table Students
(Student_no integer PRIMARY KEY
,Last_name nvarchar(30)
,First_name nvarchar(40)
,Birthday Date)

create table Schedule
(Schedule_ID integer primary key
,Section nvarchar(10) Unique
,Subject_code nvarchar(10) foreign key references Subjects(Subject_code)
,Days nvarchar(10)
,Time time
,Room nvarchar(10))

create table Enlistment
(Enlistment_ID integer primary key -- this was nvarchar in your code.
    -- Use NVARCHAR in primary keys only if you absolutely need it.
    -- If you are storing only numbers in it, you won't need NVARCHAR.
    -- use INTEGER instead.
,Student_No int foreign key references students(Student_no) identity(4100490,1)
,Schedule_ID int foreign key references Schedule(Schedule_ID) identity(650500,1))

create table Students
(Student_no integer PRIMARY KEY
,Last_name nvarchar(30)
,First_name nvarchar(40)
,Birthday Date)

create table Schedule
(Schedule_ID integer primary key
,Section nvarchar(10) Unique
,Subject_code nvarchar(10) foreign key references Subjects(Subject_code)
,Days nvarchar(10)
,Time time
,Room nvarchar(10))

create table Enlistment
(Enlistment_ID integer primary key -- this was nvarchar in your code.
    -- Use NVARCHAR in primary keys only if you absolutely need it.
    -- If you are storing only numbers in it, you won't need NVARCHAR.
    -- use INTEGER instead.
,Student_No int foreign key references students(Student_no) identity(4100490,1)
,Schedule_ID int foreign key references Schedule(Schedule_ID) identity(650500,1))