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https://community.oracle.com/tech/developers/discussion/899728/subtract-1-hour-from-date#:~:text=In%20Oracle%2C%20when%20you%20add%20or%20subtract%20a,hour%2C%20SYSDATE%20-%201%2F24%2F60%20subtracts%20a%20minute%2C%20etc.
https://stackoverflow.com/questions/30772434/how-to-subtract-hours-from-a-date-in-oracle-so-it-affects-the-day-also
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://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 C, 4 extract (SECOND from DIFF) / 60 / 60 D.
https://www.sitepoint.com/community/t/oracle-subtracting-2-hours-from-date-returned/1491
Oracle - subtracting 2 hours from date returned. Databases. aliaga61 January 13, 2004, 7:44pm #1. I am trying to write a query that will check. where row_date >= sysdate - 2 hours.
https://community.oracle.com/tech/developers/discussion/26777/how-to-subtract-time-from-sysdate
Even this simple query also works fine , I Tried on Oracle 9i. select to_char (sysdate -8/24, ' dd-mm-yy hh24:mi:ss' ) "SUB_TIME" from dual ; Explanation : ---------------------. U can check out in this way. sql> set time on. 22:48:31 sql >. now , if u want to remove 8 hours from sysdate, type the above statement as.
https://p2p.wrox.com/oracle/8930-how-subtract-hours-sysdate-oracle.html
You need to compare the date with (sysdate - 50/24) i.e. you need to convert 50 hours into days first. The following execution sequence shows how you can use "decode(sign())" function to compare the dates in the dummy table t. SQL> select to_char(dt, 'fmDay, dd Month yyyy hh24:mi:ss') "Date" from t;
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