oracle 时间计算

 

oracle date add minutes How does one add a day/hour/minute/second to a date value? Submitted by admin on Wed, 2004-08-04 14:16 The SYSDATE pseudo-column shows the current system date and time. Adding 1 to SYSDATE will advance the date by 1

oracle date add minutes

How does one add a day/hour/minute/second to a date value?

Submitted by admin on Wed, 2004-08-04 14:16 The SYSDATE pseudo-column shows the current system date and time. Adding 1 to SYSDATE will advance the date by 1 day. Use fractions to add hours, minutes or seconds to the date. Look at these examples:

SQL> select sysdate, sysdate+1/24, sysdate +1/1440, sysdate + 1/86400 from dual;

SYSDATE SYSDATE+1/24 SYSDATE+1/1440 SYSDATE+1/86400

-------------------- -------------------- -------------------- --------------------

03-Jul-2002 08:32:12 03-Jul-2002 09:32:12 03-Jul-2002 08:33:12 03-Jul-2002 08:32:13

The following format is frequently used with Oracle Replication:

select sysdate NOW, sysdate+30/(24*60*60) NOW_PLUS_30_SECS from dual;

NOW NOW_PLUS_30_SECS

-------------------- --------------------

03-JUL-2005 16:47:23 03-JUL-2005 16:47:53

Here are a couple of examples:

Description Date Expression

Now SYSDATE

Tomorow/ next day SYSDATE + 1

Seven days from now SYSDATE + 7

One hour from now SYSDATE + 1/24

Three hours from now SYSDATE + 3/24

An half hour from now SYSDATE + 1/48

10 minutes from now SYSDATE + 10/1440

30 seconds from now SYSDATE + 30/86400

Tomorrow at 12 midnight TRUNC(SYSDATE + 1)

Tomorrow at 8 AM TRUNC(SYSDATE + 1) + 8/24

Next Monday at 12:00 noon NEXT_DAY(TRUNC(SYSDATE), 'MONDAY') + 12/24

First day of the month at 12 midnight TRUNC(LAST_DAY(SYSDATE ) + 1)

The next Monday, Wednesday or Friday at 9 a.m TRUNC(LEAST(NEXT_DAY(sysdate,''MONDAY' ' ),NEXT_DAY(sysdate,''WEDNESDAY''), NEXT_DAY(sysdate,''FRIDAY'' ))) + (9/24)