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https://stackoverflow.com/questions/9488475/how-can-i-get-the-difference-in-hours-between-two-dates
Diference between two dates in hours. SELECT ROUND(minutes_ / 60, 2) || ' Hours ' FROM ( SELECT (sysdate - to_date('16/10/2019 18:45:00', 'DD/MM/YYYY HH24:MI:SS')) * 24 * 60 AS minutes_ FROM dual); Diference between two dates in hours (truncate)
https://stackoverflow.com/questions/1096853/calculate-difference-between-2-date-times-in-oracle-sql
If your date is stored as character data, you have to convert it to a date type first. SQL> select 24 * (to_date ('2009-07-07 22:00', 'YYYY-MM-DD hh24:mi') - to_date ('2009-07-07 19:30', 'YYYY-MM-DD hh24:mi')) diff_hours from dual; DIFF_HOURS ---------- 2.5. Note:
https://searchoracle.techtarget.com/answer/Difference-between-two-dates-in-hours
The second row is only 30 minutes apart, so the difference is 0.0208 days. Taking out our calculator, we see that 30 minutes equals 1day/24hours*0.5 = 0.208333, so the value is correct! So now that we know how subtracting dates works, we can perform some simple math to determine the number of hours between two dates.
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
http://dba-oracle.com/t_date_difference.htm
Answer: Oracle supports date arithmetic and you can make expressions like "date1 - date2" using date subtraction to get the difference between the two dates. 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 * …
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