[GENERAL] is there any difference DROP PRIMARY KEY in oracle and postgres?

[M Tarkeshwar Rao]

Hi,

one thing in oracle is there any difference between "DROP PRIMARY KEY" used 
directly in oracle to drop primary key, or "DROP CONSTRAINT CDRAUDITPOINT_pk", 
as first syntax is not available in postgres and we need to give primary key 
name as constraint to delete a key. SO right now to delete primary key I am 
using second approach, so is there any difference between two?

Regards
Tarkeshwar