The start date and time and stop date and time fields in my DB is numeric (length of date fields are 8 and that of time field is 6.). I have to calculate duration for each record and return as a result dataset (with other fields) from a stored procedure. How can I do this? You would have to break the dates and times into the pieces, multiply them into seconds and subtract, giving you the seconds, then divide to get the pieces back together....
Alternatively, I would suggest calling an RPG or other HLL program inside the stored procedure to calculate the difference or use a different method altogether.
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