Question

I have two dates in my code..date 1 and date2.
I want to calculate the number of sundays between the above dates,
I am using IBM DB2.

Thanks in advance.

Answer 1

I’m not sure of what you mean in your code.

If you have values you’re trying to lookup from a database the most sustainable way would be to create a function that you could call. If this is not doable as a result of your permissions / etc. you can take a look at the below SQL:

WITH DATE_EXAMPLES (DATE_1, DATE_2) AS (
    VALUES ( TIMESTAMP('2012-03-04 01:01:01'),TIMESTAMP('2012-03-25 01:01:01'))
)
SELECT  DATE_EXAMPLES.*, 
    CASE WHEN DAYOFWEEK(DATE_2) < DAYOFWEEK(DATE_1) 
            THEN    ((DAYS(DATE_2) - DAYS(DATE_1)) / 7) + 1
            ELSE    ((DAYS(DATE_2) - DAYS(DATE_1)) / 7)
    END SUNDAYS_BETWEEN        
FROM DATE_EXAMPLES

*Please note: The DAYOFWEEK call will return a number range of 1-7 where 1 is Sunday and 7 is Saturday.