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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=In%20order%20to%20subtract%20hrs%20you%20need%20to,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://community.oracle.com/tech/developers/discussion/899728/subtract-1-hour-from-date
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://blogs.oracle.com/oraclemagazine/post/working-with-dates-in-plsql
Dates, Time Stamps, and Intervals in PL/SQL Most applications require the storage and manipulation of dates and times. Unlike strings and numbers, dates are quite complicated: not only are they highly formatted data, but there are also many rules for determining valid values and valid calculations (leap days and years, daylight saving time ...
https://www.geeksforgeeks.org/useful-date-and-time-functions-in-pl-sql/
https://www.tutorialspoint.com/plsql/plsql_date_time.htm
There are two classes of date and time related data types in PL/SQL −. Datetime data types. Interval data types. The Datetime data types are −. DATE. TIMESTAMP. TIMESTAMP WITH TIME ZONE. TIMESTAMP WITH LOCAL TIME ZONE. The Interval data types are −.
https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:9533411800346926170
To get the total number of Hours, you would need to CONVERT the quantity of days to Hours and add it with the other components, more or less like : SQL> select extract (DAY from DIFF)*24 A, 2 extract (HOUR from DIFF) B, 3 extract ( MINUTE from DIFF) / 60 …
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