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Function in param, start_date & number , return sums next working day

722698
722698 Member Posts: 7
edited Sep 17, 2009 2:41AM in SQL & PL/SQL
Hi Friends,

I need a funtion which can take in parameters as start_date and number , sum them as new date and return new_start_date as workind day.
Suppose '15-SEP-2009' + 6 should return 23-SEP-2009 as new date.
Basically the sum of date and number should return next working day (excluding saturday,sunday).
e.g '15-SEP-2009' + 6 =21-SEP-2009 , but it includes saturday and sunday , so it should return 23-SEP-2009.

Thanks
Niren
«1

Answers

  • 722698
    722698 Member Posts: 7
    create or replace function add_working_days(
    p_days in number,
    p_dt in date default trunc(sysdate)
    )
    return date
    as
    v_weeks number;
    v_adj number;
    begin

    v_weeks := trunc(p_days/5);

    if to_number(to_char(p_dt,'D')) + mod(p_days,5) >= 7 then
    v_adj := 2;
    else
    v_adj := 0;
    end if;

    return p_dt + 7*v_weeks + v_adj+mod(p_days,5);
    end add_working_days;




    This is not working correct if the date is SATURDAY, but seems working M-F and Sunday

    select trunc(sysdate)+4,add_working_days(6,trunc(sysdate)+4) from dual;
    Output : 19-sep2009 29-Sep-2009
  • 722698
    722698 Member Posts: 7
    create or replace function add_working_days(
    p_days in number,
    p_dt in date default trunc(sysdate)
    )
    return date
    as
    v_weeks number;
    v_adj number;
    begin

    v_weeks := trunc(p_days/5);


    if to_number(to_char(p_dt,'D')) + mod(p_days,5) >= 7 then
    v_adj := 2;
    else
    v_adj := 0;
    end if;


    return p_dt + 7*v_weeks + v_adj+mod(p_days,5);
    end add_working_days;





    This is not working correct if the date is SATURDAY, but seems working M-F and Sunday


    select trunc(sysdate)+4,add_working_days(6,trunc(sysdate)+4) from dual;
    Output : 19-sep2009 29-Sep-2009
  • Frank Kulash
    Frank Kulash Member, Moderator Posts: 42,032 Red Diamond
    edited Sep 15, 2009 3:10PM
    Hi, Niren,

    [This thread|http://forums.oracle.com/forums/thread.jspa?messageID=3351822&#3351822] should give you some ideas. It does it without using PL/SQL, so it's actually a harder problem.

    In PL/SQL, you could loop through the days, starting with the start_date parameter and decrementing a counter that is initialized to the other parameter, stopping when the counter reaches 0.
    Or you could write a recursive function.
  • Arunkumar Ramamoorthy-Oracle
    Arunkumar Ramamoorthy-Oracle Member Posts: 5,880 Employee
    edited Sep 15, 2009 2:30PM
    Like this?
    SQL> ed
    Wrote file afiedt.buf
    
    create or replace function next_working_day(start_date in date,  add_days in number) return date is
    return_date date;
    begin
    return_date:=start_date+add_days;
    if (UPPER(to_char(return_date,'FMDAY'))='SATURDAY') then
    return_date:=return_date+2;
    elsif (UPPER(to_char(return_date,'FMDAY'))='SUNDAY') then
    return_date:=return_date+1;
    end if;
    return return_date;
    end;
    SQL> /
    
    Function created.
    
    SQL> select next_working_day('10-AUG-2009',10) FROM DUAL;
    
    NEXT_WORK
    ---------
    20-AUG-09
    
    SQL> select next_working_day('11-SEP-2009',1) from dual;
    
    NEXT_WORK
    ---------
    14-SEP-09
    
    SQL> 
    -Arun

    Tested

    Posted after testing
  • 722698
    722698 Member Posts: 7
    Hi Frant,

    Please explain me with an example. If you have the exact function/Procedure than it can really help.

    Thanks
    Niren
  • Frank Kulash
    Frank Kulash Member, Moderator Posts: 42,032 Red Diamond
    edited Sep 15, 2009 3:33PM
    Hi, Niren,

    The first respondent gave a better function for testing for work days (Monday through Friday). If there's a bug with Saturdays, I'm sure that can fixed. Also,that function depends on your NLS settings. If that's an issue for you, that can be fixed, too. The idea that there are 5 work days in any 7 consecutive days will cut down the execution time considerable.

    A function like I suggested would be useful if you had to consider holidays as well as weekends.
    Here's an untested example:
    CREATE OR REPLACE FUNCTION  work_days_away
    (      in_start_date	    DATE
    ,      in_day_cnt	    NUMBER
    )
    RETURN	DATE
    DETERMINISTIC
    IS
    (
    	IF  in_start_date - TRUNC (in_start_date, 'IW') >= 5
    	OR  is_holiday (in_start_date)
    	THEN
    		RETURN  work_days_away ( in_start_date + 1
    				       , in_day_cnt
    				       );
    	ELSIF  in_day_cnt >= 1
    	THEN
    		RETURN  work_days_away ( in_start_date + 1
    				       , in_day_cnt    - 1
    				       );
    	ELSE
    		RETURN  in_start_date;
    	END IF;
    END	work_days_away;
    This use the date format 'IW', which does not depend on NLS settings, rather than 'D', which does.
  • 722698
    722698 Member Posts: 7
    Hi Arun,

    The code example where 10-AUG-2009 + 10 days should return 22 as per the need but your code is not considering the saturday and sunday falling on 15,16 Aug 2009.

    Thanks
    Niren
  • Arunkumar Ramamoorthy-Oracle
    Arunkumar Ramamoorthy-Oracle Member Posts: 5,880 Employee
    Hi,

    I was under the impression that, after adding the days, if the result falls on saturday / sunday, it should consider that and return the next working day i.e monday.

    So, 10-AUG-2009 + 10 = 20-AUG-2009 which falls on Thursday.
    11-SEP-2009 + 1 = 12-SEP-2009 which falls on Saturday. So, the next working day is Monday which is 14-Sep-2009.

    Please let me know if my understanding about your requirement is not correct.

    -Arun
  • 722698
    722698 Member Posts: 7
    Hi Arun,

    Basically the need is that any number of days added to a date should return date excluding all saturdays and sundays falling in between.
    It would be great if you could help me on this .

    Thanks
    Niren
    +919873314561
  • Arunkumar Ramamoorthy-Oracle
    Arunkumar Ramamoorthy-Oracle Member Posts: 5,880 Employee
    edited Sep 16, 2009 5:01AM
    How about this?
    create or replace function add_working_days(
    p_days in number,
    p_dt in date default trunc(sysdate)
    )
    return date
    as
    v_weeks number;
    v_adj number;
    begin
    
    v_weeks := trunc(p_days/5);
    
    if to_number(to_char(p_dt,'D')) + mod(p_days,5) <= 6 then
    v_adj := 1;
    elsif to_number(to_char(p_dt,'D')) + mod(p_days,5) = 7 then
    v_adj := 2;
    else
    v_adj := 0;
    end if;
    
    return p_dt + 7*v_weeks + v_adj+mod(p_days,5);
    end add_working_days;
    -Arun

    Untested
This discussion has been closed.