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https://stackoverflow.com/questions/30772434/how-to-subtract-hours-from-a-date-in-oracle-so-it-affects-the-day-also#:~:text=date%20-%20nwill%20subtract%20n%20days%20form%20given,subract%202%20days%20and%202%20hrs%20from%20sysdate.
https://stackoverflow.com/questions/30772434/how-to-subtract-hours-from-a-date-in-oracle-so-it-affects-the-day-also
date - n will subtract n days form given date. 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://docs.oracle.com/cd/E17952_01/mysql-5.6-en/date-and-time-functions.html
ADDDATE(date,INTERVAL expr unit), ADDDATE(expr,days) When invoked with the INTERVAL …
https://stackoverflow.com/questions/28882878/how-to-get-last-24-hours-from-current-time-stamp
Assuming you're using SQL Server 2012 or above, you could ANSI interval literals instead of dateadd(): select Name, Location, myDate from myTable where myDate>= getdate() - INTERVAL '24' HOUR; If you want to be really ANSI standard, you can use CURRENT_TIMESTAMP instead of getdate() (the two are equivalent).
http://dba-oracle.com/t_date_difference.htm
Once you have the date difference, you can use simple techniques to express the difference in days, hours, minutes or seconds. The minus sign is used to compute the difference between two dates: SQL> select 24 * (to_date('20014-06-19', 'YYYY-MM-DD') - to_date('2010-07-07', 'YYYY-MM-DD')) date_difference from dual; SQL> SELECT to_date('2015-08-05','YYYY-MM …
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://stackoverflow.com/questions/16084484/subtract-one-hour-from-datetime-rather-than-one-day
SELECT MAX (D_DTM) - INTERVAL '1' HOUR FROM tbl1. The nice thing about the INTERVAL function is that you can make the interval be years, months, days, hours, minutes or seconds when dealing with a DATE value, though the month interval can be tricky when dealing with end-of-month dates. And yes, the quote around the 1 in the example is required.
https://asktom.oracle.com/Misc/DateDiff.html
With Oracle Dates, this is pretty trivial, you can get either TOTAL (days, hours, minutes, seconds) between 2 dates simply by subtracting them or with a little mod'ing you can get Days/Hours/Minutes/Seconds between. For example: SQL> set serveroutput on SQL> SQL> declare 2 a date; 3 b date; 4 begin
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