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sudo docker exec -it oracle-free sqlplus sys/abc123 as sysdba

SHOW CON_NAME;

ALTER SESSION SET CONTAINER = FREEPDB1;  ## set db to FREEPDB1

CREATE USER "zhamri" IDENTIFIED BY "zhamri123";  ## nama huruf kecil
GRANT DBA TO "zhamri";

SELECT username FROM all_users WHERE username = 'zhamri';

sudo docker exec -it oracle-free sqlplus zhamri/zhamri123 as sysdba

sudo docker exec -it oracle-free sqlplus "zhamri"/zhamri123@localhost:1521/FREEPDB1
sudo docker exec -it oracle-free sqlplus "zhamri"/zhamri123@FREEPDB1

OR

sudo docker exec -it oracle-free bash
sqlplus "\"zhamri\"/zhamri123@//localhost:1521/freepdb1"