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https://www.tutorialspoint.com/plsql/plsql_date_time.htm
https://stackoverflow.com/questions/1096853/calculate-difference-between-2-date-times-in-oracle-sql
SQL> select oldest - creation from my_table; 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://blogs.oracle.com/oraclemagazine/post/working-with-dates-in-plsql
It has multiple parts (year, month, day, hour, and so on), and there are many rules about what constitutes a valid date. This article gives you all the information you need in order to begin working with dates in your PL/SQL programs. Dates, Time Stamps, and Intervals in PL/SQL. Most applications require the storage and manipulation of dates ...
https://www.geeksforgeeks.org/useful-date-and-time-functions-in-pl-sql/
https://dotnet.guide/developer/sql/get-difference-two-date-times-hours-sql-datediff.html
DATEDIFF function gives us the difference between given dates and also can convert that output to various other time formats like, Hours, Minutes, Seconds, Days etc. Description of the above line of code. DATEDIFF – Name of function. hh – First parameter which denotes the output should be in hh (hours) format.
https://asktom.oracle.com/Misc/DateDiff.html
Just subtract. You get the difference in days. Multiply by 24 -- hours, multiply by 60 minutes, multiply by 60 -- seconds. If you really want 'datediff' in your database, you can just do something like this: SQL> create or replace function datediff( p_what in varchar2, 2 …
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