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Editorial Team
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Asked: 2026-05-31T01:43:54+00:00

I had a problem but part was solving thanks to this question , but

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I had a problem but part was solving thanks to this question, but know i want to know how can i count the days beetween a given interval.

It is a query to count how many days an employee goes to vacation. So given (or not given) a date range, i would like count how many vacation days are beetween given interval.

Currenty my SQL is like this:

SELECT SUM(DATEDIFF(vacation_end_date,vacation_start_date))
FROM vacation WHERE vacation_end_date >= given_start_date 
AND vacation_start_date <= given_end_date'

I know thatthe DATEDIFF will only work for days inside given range, but it shouldn’t count days outside from given range.

Please help me, couldn’t find something similar on Stack Overflow.

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1 Answer

  1. Editorial Team

    If vacation_end_date is the day the person is back from vacation and not his last day vacationing, the query to get the person’s vacation days between 2012-01-01 (inclusive) and 2013-01-01 (exclusive) would be;

    SELECT SUM(
 GREATEST(0, 
  DATEDIFF(
   LEAST('2013-01-01', vacation_end_date),
   GREATEST('2012-01-01', vacation_start_date)
))) 'VACATION_DAYS'
FROM vacation;

    If vacation_end_date is his last vacation day, you’ll need to replace vacation_end_date with ADDDATE(vacation_end_date, INTERVAL 1 DAY)) in the query above to get the calculation correct.

    Simple demo here.

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