How to Calculate workdays in sql between assigned date and current date. Should exclude weekends.

I am using bigquery so the acceptable syntax is

datediff( CURRENT_DATE(),(timestamp(h.ARRIVAL_TIME_PAC_TZ))) as Aging_from_Arrival

calculates diffference between current and arrival date but it adds weekends too. Is there way to calculate only weekdays excluding weekends and holidays if possible.
Tulip_23Asked:
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DavidSenior Oracle Database AdministratorCommented:
DATEDIFF("weekday",[Calculation1],[Calculation2])-2*(DATEPART('week', [Calculation2]) -DATEPART('week', [Calculation1]))

Calculation 1, 2 are the dates
source: http://community.tableau.com/thread/107647
sdstuberCommented:
In oracle, I'd create a function to do the math


create or replace FUNCTION weekdays_between(p_start IN DATE, p_end IN DATE)
    RETURN NUMBER
    DETERMINISTIC
IS
    v_start          DATE := TRUNC(LEAST(p_start, p_end));
    v_end            DATE := TRUNC(GREATEST(p_start, p_end));

    v_start_sunday   DATE := NEXT_DAY(v_start - 7, 'Sun');
    v_end_sunday     DATE := NEXT_DAY(v_end - 7, 'Sun');
BEGIN
    RETURN   v_end
           - v_start
           + 1 -- all days
           - (v_end_sunday - v_start_sunday) / 7 * 2 -- substract weekends
           - CASE WHEN TO_CHAR(v_start, 'Dy') = 'Sun' THEN 1 ELSE 0 END -- subtract first day if it is Sunday
           - CASE WHEN TO_CHAR(v_end, 'Dy') = 'Sat' THEN 1 ELSE 0 END -- substract last day if it is Saturday
                                                                     ;
END;

I use next_day instead of trunc to make it easier to transition between NLS settings, just change Sat and Sun to whatever the abbreviation is for the language needed.

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