Number of week days remaining in month

Question

Hi Guys,
I am looking to create a function which returns the number of working days (Monday to Friday) there are between sysdate and the last day of the month.
Has anyone done something similar.
I have tried the following:
<code>
CURSOR days_c
IS
SELECT LEVEL
     , to_char(LAST_DAY(ADD_MONTHS(SYSDATE, -1))+LEVEL,'Dy DD-Mon-YYYY') AS DOW --day of week
FROM dual
WHERE ROWNUM <= EXTRACT(DAY FROM LAST_DAY(SYSDATE))
CONNECT BY LEVEL=ROWNUM;
v_cnt NUMBER :=0;
BEGIN
  FOR days_r IN days_c
   LOOP
    IF to_char(days_r.DOW) NOT LIKE 'Sat%' OR to_char(days_r.DOW) NOT LIKE 'Sun%'
     --AND to_date(days_r.dow) > sysdate
     THEN
      v_cnt := v_cnt +1;  
    END IF;
   END LOOP;
  RETURN v_cnt;
</code>
At the moment, the IF logic around the days_r.DOW isnt working as I am also struggling to only return dates greater than today but less than the end of the month.
Thanks in advance
Chris

Answer 1

if you don't want to use ALL_OBJECTS
SELECT ROWNUM RNUM
            FROM ALL_OBJECTS
           WHERE ROWNUM <= DATE_TO - DATE_FROM + 1
you can write code as well as:
CREATE OR REPLACE FUNCTION COUNT_WORK_DAYS(DATE_FROM IN DATE,
                                           DATE_TO   IN DATE) RETURN NUMBER
  RESULT NUMBER;
BEGIN
  SELECT COUNT(*)
    INTO RESULT
    FROM (SELECT level RNUM
            FROM dual
           connect by  level <= DATE_TO - DATE_FROM + 1)
   WHERE (TO_CHAR(DATE_FROM + RNUM - 1, 'DY', 'NLS_DATE_LANGUAGE=ENGLISH') NOT IN ( 'SUN', 'SAT')
         OR (DATE_FROM + RNUM - 1) IN(SELECT TO_DATE(T.GL_VALUE1, 'DD.MM.YYYY')
                                      FROM CALENDARTABLE T WHERE T.GL_VRB = 'WORKHOLIDAY')) --Getting Holidays which are Working Days from local CalendarTable and calculate as working day
     AND (DATE_FROM + RNUM - 1) NOT IN (SELECT TO_DATE(T.GL_VALUE1, 'DD.MM.YYYY')
                                          FROM BSB_GL.GL_VARIABLE T
                                        WHERE T.GL_VRB = 'HOLIDAY') --Getting NATIONAL Holidays from local CalendarTable
  RETURN(RESULT);
END GL_COUNT_WORK_DAYS;
Ramin Hashimzade