NEXT_DAY returns the next day specified in the day_to_find argument from the date argument. day_to_find must be a string denoting a valid day of the week.
Syntax:
NEXT_DAY(date,day_to_find)
Example:
SELECT NEXT_DAY(’23-OCT-2004′,’FRIDAY’) AS RESULT FROM DUAL;
RESULT
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29-OCT-2004 00:00:00
Next_day – Oracle SQL Function