Function to get number of weekdays between two dates excluding holidays

Question

I have an sql query that casts 2 dates and checks if they are equal. But even though the dates are equal, i dont get the result.

create or replace 
FUNCTION          


        

Answer 1

I am guessing that you are using Oracle. If so, the DATE data type contains a time component. This is rather confusing. But you could do what you want using TRUNC() rather than CAST():

SELECT TRUNC(HOLIDAY_DATE), DATE '2011-04-16'  --into DAY_COUNT
FROM ATL_JOB_HOLIDAY jh JOIN
     ATL_MASTER_JOB mj
     ON mj.MASTER_JOB_ID = jh.MASTER_JOB_ID
WHERE TRUNC(HOLIDAY_DATE) = DATE '2011-04-16';

Note also the preference for ANSI standard dates and for table aliases.