SELECT TO_CHAR(SYSDATE, ‘DD-MON-YYYY’) – ’01-JAN-2019’ FROM DUAL;
SELECT SYSDATE – TO_DATE(’01-JANUARY-2019’) FROM DUAL;
SELECT ROUND(SYSDATE – ’01-JAN-2019’) FROM DUAL;
SELECT ROUND(SYSDATE – TO_DATE(‘01/JANUARY/2019’)) FROM DUAL;
SELECT TO_DATE(SYSDATE, ‘DD/MONTH/YYYY’) – ‘01/JANUARY/2019’ FROM DUAL;