Problem with foreign key

[booker]

Hello,
I have a problem with foreign key. What I want to do is , have one foreign key referencing in two different tables! I have created three tables:

create table University(
UniversityID int not null,
Name nvarchar(50),
.....
.....
.....
primary key(UniversityI D )
);

create table Person(
PersonID int not null,
Name nvarchar(50),
.....
.....
.....
primary key(PersonID )
);

create table Borrower(
BorrowerID int not null,
Name nvarchar(50),
MemberName int,
.....
.....
.....
primary key(BorrowerID )
foreign key(MemberName) reference University,
foreign key(MemberName) reference Person,

);

So I want to have one column (in my example MemeberName) which referencing in two different tables. How can I do that??

[Motoma]

I am not entirely sure what you are trying to accomplish, could you please reword you question a little?

[booker]

I am not entirely sure what you are trying to accomplish, could you please reword you question a little?

Ok, Sorry for that. Well, I have created three tables University, Person and Borrower. What I want to do is to have one column in table Borrower (lets say with name MemberId) which will be foreign key referencing together in the other two tables.
For example I gave the below syntax in SQL Server but it does not work:

create table Borrower(
BorrowerID .............,
............... ......,
............... ........,
............... ..........,

foreign key (MemberID) references University,
foreign key (MemberID) references Person
);

[Motoma]

So you want the key to exist in either one of the tables? I'm not quite sure of the interaction you are looking for.

[booker]

So you want the key to exist in either one of the tables? I'm not quite sure of the interaction you are looking for.

ok I see. I will try to find another way. thanks