Select Syntax (join within containers)

I am looking for the correct syntax to perform joins with the container.

Test Script:

create user c##pojen identified by oracle_4U;

grant dba,set container to c##pojen container=ALL;

create pluggable database PLAY1 admin user admin identified by oracle_4U;

create pluggable database WORK1 admin user admin identified by oracle_4U;

alter pluggable database all open;

connect c##pojen/oracle_4U

create table c##pojen.po (eid number, ename varchar2(255));

create table c##pojen.jen(eid number, ename varchar2(255));

alter session set container=PLAY1;

create table c##pojen.po (eid number, ename varchar2(255));

create table c##pojen.jen(eid number, ename varchar2(255));