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https://stackoverflow.com/questions/30772434/how-to-subtract-hours-from-a-date-in-oracle-so-it-affects-the-day-also
Jun 10, 2015 · 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://www.akadia.com/services/ora_date_time.html
You can add and subtract number constants as well as other dates from dates. Oracle interprets number constants in arithmetic date expressions as numbers of days. For example: SYSDATE + 1 is tomorrow; SYSDATE - 7 is one week ago; SYSDATE + (10/1440) is ten minutes from now.MM: Month (01-12; JAN = 01).
https://riptutorial.com/oracle/example/7493/date-arithmetic---difference-between-dates-in-days--hours--minutes-and-or-seconds
Dec 25, 2015 · Example #. In oracle, the difference (in days and/or fractions thereof) between two DATE s can be found using subtraction: The difference in hours, minutes or seconds can be found by multiplying this number by 24, 24*60 or 24*60*60 respectively.
http://www.dba-oracle.com/t_date_arithmetic.htm
Mar 12, 2016 · When performing Oracle date arithmetic, it might be tempting to use sophisticated conversion functions to convert a data, but we will see that this is not the most elegant solution: round (to_number (end-date-start_date)*24)- elapsed hours. round (to_number (end-date-start_date)*1440)- elapsed minutes.
https://stackoverflow.com/questions/11970311/sql-select-subtract-date-time-with-date-time
Jul 18, 2012 · SELECT (firstDateColumn - secondDateColumn) * 24 * 60 difference_in_minutes FROM yourtable. If the dates are string then convert them first: SELECT (TO_DATE (firstDateColumn, 'dd/mm/yyyy HH:MI:SS AM') - TO_DATE (secondDateColumn, 'dd/mm/yyyy HH:MI:SS AM')) * 24 * 60 difference_in_minutes FROM yourtable. Share.
https://stackoverflow.com/questions/9488475/how-can-i-get-the-difference-in-hours-between-two-dates
Feb 28, 2012 · I have to do a "select" that returns the difference between a field of type date from the database and the current date in hours. How can I do this in oracle? I try this: select 24 * (to_date(sysdate, 'YYYY-MM-DD hh24:mi') - to_date('2012-02-28 15:20', 'YYYY-MM-DD hh24:mi')) diff_hours from dual; ... When subtracting two different dates in ...
https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:9533411800346926170
Feb 14, 2017 · 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 C, 4 extract (SECOND from DIFF) / 60 / 60 D.
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