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https://www.oracletutorial.com/oracle-date-functions/oracle-sysdate/#:~:text=The%20following%20table%20illustrates%20the%20arithmetic%20of%20the,%208%20hours%20%204%20more%20rows%20
http://www.nazmulhuda.info/use-of-sysdate-in-oracle
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.dba-oracle.com/tips_oracle_sysdate_example.htm
SYSDATE-(SYSDATE-3)----- 3. Here we see that elapsed times are expressed in days. Hence, we can use easy conversion functions to convert this to hours or minutes. However, when the minutes are not a whole number, we have the problem of trailing decimal places: select (sysdate-(sysdate-3.111))*1440 from dual; (SYSDATE-(SYSDATE-3.111))*1440
https://www.oracletutorial.com/oracle-date-functions/oracle-sysdate/
https://docs.microsoft.com/en-us/sql/t-sql/functions/sysdatetime-transact-sql
SQL Server obtains the date and time values by using the GetSystemTimeAsFileTime () Windows API. The accuracy depends on the computer hardware and version of Windows on which the instance of SQL Server is running. The precision of this API is fixed at 100 nanoseconds. The accuracy can be determined by using the GetSystemTimeAdjustment ...
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