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https://community.oracle.com/tech/developers/discussion/26777/how-to-subtract-time-from-sysdate#:~:text=If%20you%20want%20to%20set%20the%20clock%20back%2C,of%20the%20day%20before%20the%20day%20in%20SYSDATE.
https://stackoverflow.com/questions/30772434/how-to-subtract-hours-from-a-date-in-oracle-so-it-affects-the-day-also
In order to subtract hrs you need to convert it into day buy dividing it with 24. In your case it should be to_char(sysdate - (2 + 2/24), 'MM-DD-YYYY HH24') . This will subract 2 days and 2 hrs from sysdate.
https://community.oracle.com/tech/developers/discussion/26777/how-to-subtract-time-from-sysdate
If you want to set the clock back, by calculating a "date" that is 8 hours less than the SYSDATE, then SYSDATE - (8/24) will do that. This will work even if SYSDATE was something like 2 a.m., because it will then set it to 6 p.m. of the day before the day in SYSDATE.
https://community.oracle.com/tech/developers/discussion/899728/subtract-1-hour-from-date
SYSDATE - 1/24 or SYSDATE - INTERVAL '1' HOUR will subtract 1 hour from SYSDATE. In Oracle, when you add or subtract a number to a date, the unit is days. So SYSDATE + 1 adds 1 day. To add some other increment, you just multiply or divide appropriately, i.e. SYSDATE - 1/24 subtracts an hour, SYSDATE - 1/24/60 subtracts a minute, etc.
https://p2p.wrox.com/oracle/8930-how-subtract-hours-sysdate-oracle.html
How to subtract hours from sysdate in oracle. There are no SQL functions that works on the current row and the previous or next row. The functions work across all rows. What you'll need to do is write a PL/SQL procedure or function or anonymous block, where your select statement is a cursor, and process the rows of the cursor, using extra ...
https://www.experts-exchange.com/questions/21606263/How-to-subtract-hours-and-minutes-from-a-Sysdate-or-Timestamp.html
How to subtract hours and minutes from a Sysdate or Timestamp. endrec asked on 10/24/2005. Oracle Database. 6 Comments 2 Solutions 38241 Views Last Modified: 5/5/2012. How would I subtract 3 hours from the following two commands? || to_char(sysdate,'Dy, dd Mon YYYY HH24:MI:SS') ...
https://www.sitepoint.com/community/t/oracle-subtracting-2-hours-from-date-returned/1491
i trust the interval arithmetic expression to give the correct time, whereas sysdate-2/24 is a date minus a fraction, and who knows if that will come up with the same datetime result
https://www.oracletutorial.com/oracle-date-functions/oracle-sysdate/
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