cara menambahkan detik di stempel waktu oracle

Anda selalu dapat menggunakan pecahan (untuk Oracle 1 =1 hari):

SELECT CURRENT_TIMESTAMP ,
       CURRENT_TIMESTAMP + 200 *(1/24/60/60) AS addedTime 
FROM dual;
<=>
SELECT CURRENT_TIMESTAMP + 200/86400 FROM dual

Demo DBFiddle

atau:

SELECT CURRENT_TIMESTAMP + INTERVAL '200' SECOND FROM dual