How can I get the difference in hours between two dates?

Question

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?

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Answer 1

Diference between two dates in hours and minutes

SELECT     TRUNC(minutes_ / 60) || ' Hours, ' || TRUNC(MOD(minutes_,  60)) || ' Minutes'  diference
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

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)

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
);