Implementing one-to-many relationship

One-to-many relation can be implemented by using two tables.. in two ways :

e.g we have a Department table and a Student Table

1. Department :
DeptID -> Primary Key
DeptName
DeptHead

Student :
StudentID -> Primary Key
StudentName
DeptID -> Foreign Key

2. Department :
DeptID -> Primary Key
DeptName
DeptHead

Student :
StudentID -> Composite Primary Key - 1
StudentName
DeptID -> Composite Primary Key - 2