checking participation constraint

I wanted to know how can I check participation constraint for a one to man relationship in oracle.

Suppose an employee works in a department.
There can be many employees working in a department.
For a department, there has to be atleast one employee.


i cannot write -
foreign key (dept) references employee.

Then it wil be one to one relationship.

Secondly I cannot write assertions or domains in ORACLE.

Can somebody please tell me what is the procedure followed for checking this constraint?

desdc user_constraints and user_cons_columns...it will all be in there. if you have privs check dba_constraints as well.

~jimbag8