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https://smarttechways.com/2021/02/23/example-of-fetch-last-one-hour-or-minutes-time-from-sysdate/
Fetch last 4 hours report by using sysdate select sysdate "Current Time", sysdate-4/24 "Last Four hour" from dual; Current Time Last Four hour ----- ----- 23-FEB-21 09:31:13 23-FEB-21 05:31:13 Fetch last 24 hours or 1 day from current datetime SQL> select sysdate "Current Time", sysdate-1 "Last One Day" from dual;
https://stackoverflow.com/questions/30772434/how-to-subtract-hours-from-a-date-in-oracle-so-it-affects-the-day-also
I'm trying to subtract date from Oracle so it even effect the day as well. For example, if the timestamp is 01/June/2015 00 hours and if I subtract 2 hours, I want to be able to go to to 31/May/2014 22 hours. I tried. to_char(sysdate-(2/11), 'MM-DD-YYYY HH24') but it only subtracts the hour; it does not touch the day itself.
http://www.nazmulhuda.info/use-of-sysdate-in-oracle
One hour back from now. sysdate-1 / 24. Three Hours from now. sysdate + 3 / 24. Three Hours back from now. sysdate-3 / 24. Half an hour from now. sysdate + 1 / 48. Ten Minutes from now. sysdate + 10 / 1400. Ten Minutes back from now. sysdate-10 / 1400. Thirty seconds from now. sysdate + 30 / 86400. Thirty seconds back from now. sysdate-30 ...
https://www.oracletutorial.com/oracle-date-functions/oracle-sysdate/
The following example returns the current date and time of the OS where the Oracle Database resides: SELECT TO_CHAR ( SYSDATE, 'MM-DD-YYYY HH24:MI:SS') FROM dual; Code language: SQL (Structured Query Language) (sql) In this example, we used the TO_CHAR () function to format the current system date and time value returned by the SYSDATE function.
https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions172.htm
SYSDATE . Syntax. Description of the illustration sysdate.gif. Purpose. SYSDATE returns the current date and time set for the operating system on which the database resides. The datatype of the returned value is DATE, and the format returned depends on the value of the NLS_DATE_FORMAT initialization parameter. The function requires no arguments.
https://p2p.wrox.com/oracle/8930-how-subtract-hours-sysdate-oracle.html
Date Sysdate Sysdate - 50 hours Message Thursday, 1 January 2004 15:15:30 Wednesday, 4 February 2004 10:53:32 Monday, 2 February 2004 8:53:32 Date is less than sysdate - 50 hours Tuesday, 3 February 2004 10:34:45 Wednesday, 4 February 2004 10:53:32 Monday, 2 February 2004 8:53:32 Date is greater than sysdate - 50 hours
http://dba-oracle.com/t_add_hours_to_oracle_date.htm
Answer: To add hours to an Oracle date you can this simple query: select sysdate, sysdate + (1/24*5) "5 hours" from dual; The formula (1/24*5) is explained as follows: sysdate + 1 is one day ahead (exactly 24 hours) - divided by 24 gives one hour. * 5 multiply by 5 to get the 5 hours. You can also add 5 hours to a date this way: (60 * 5)
https://community.oracle.com/tech/developers/discussion/2608411/sql-to-break-down-date-by-day-and-hour-in-the-same-query
Every number that you subtranct from a date is "number of days" so, if you want to subtract 4 hours you could either write - 0.166666666666 or - 4/24 or - (1/24)*4. as an alternative you could subtract an interval like - to_dsinterval('0 04:00:00') this is also "4 hours". hth
https://www.sitepoint.com/community/t/oracle-subtracting-2-hours-from-date-returned/1491
where row_date >= sysdate - 2 hours. what would the syntax look like for this? do i need to set the date format each time i run the query? thanks. JillS January 13, 2004, 8:31pm #2. ...
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