ForeignKey Referencing only one column of a primary key created on 2 column

Let me explain the scenario
Table1
=====
studentno
identityno
marks
above table has primary key on - studentno and identityno
Table2
=====
studentno
remarks
now, because 2nd table has just studentno and not identityno, we cant add foreign key studentno but the requirement is to have some kind of referential integrity constraint on studentno of table2, so that it checks if that is present in table1
Is there any way to solve this ?

Homework?
Yes this is possible by adding an unique constraint on Table1.StudentNo. Also, since StudentNo will then be subject to two different unique constraints in Table1, inserting a row in Table1 would be a headache.
Another alternative would be to have a trigger on Table2 which checks the integrity but that is re-inventing the wheel.
but the requirement is to have some kind of referential integrity constraint on studentno of table2, so that it checks if that is present in table1I would rather re-design the table structure in this case. Current structure makes no sense to me.
Message was edited by:
Satish Kandi
@Leo: Sorry I did not refresh before posting so did not see your response.

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