Oracle composite primary key / foreign key question

Question

I have a composite primary key in 1 table in oracle. I want to create a foreign key for one table entry in my second table that references the composite primary key in the firs

Answer 1

CREATE TABLE groupspersonx( 
  personid number, groupid number, 
CONSTRAINT pk_persongroupid PRIMARY KEY(personid, groupid));

CREATE TABLE restrictedgroups ( 
  pid number, 
  groupid number,
  name varchar2(50), 
  dateadded date, 
  since date, 
  notes varchar2(1024), 
  CONSTRAINT pk_groupid PRIMARY KEY(groupid), 
  CONSTRAINT fk_persongroup FOREIGN KEY(pid,groupid) REFERENCES groupspersonx(personid, groupid));

* number of references columns is equals with foreign key columns