Re: BUG #17247: How to avoid crating multiple Foreign keys on same column on same table.

Issue: Postgres engine allows multiple FK on same columns for a same
table.This cause duplication and unwanted use of space . If we accidentally
run a script multiple times it creates the FK mulitple times.
Ran the following statement 3 times : to add a foreign key
ALTER TABLE admin.emp
ADD FOREIGN KEY (deptno)
REFERENCES admin.dept (deptno)
ON DELETE NO ACTION;

I see 3 its created thrice . In Oracle this statement should fail. Is there
any way this restriction can be applied on PG.
admin   emp_deptno_fkey emp     deptno  admin   dept    deptno
admin   emp_deptno_fkey1        emp     deptno  admin   dept    deptno
admin   emp_deptno_fkey2        emp     deptno  admin   dept    deptno

Please advice.