select (1/24/60) from dual (1/24/60) ---------- 0,00069444 1 row selected select sysdate, sysdate - 0.00069444 from dual SYSDATE SYSDATE-0.00069444 ------------------- ------------------- 21.04.2008 14:41:18 21.04.2008 14:40:18 1 row selected select sysdate, sysdate - (1/24/60) from dual SYSDATE SYSDATE-(1/24/60) ------------------- ------------------- 21.04.2008 14:41:18 21.04.2008 14:40:18 1 row selected