Decode in a where clause with "in"

Question

Hi,
I'm working with Oracle9i Enterprise Edition Release 9.2.0.7.0
I'm trying to write a function that retuns the number of days between two dates, minus holidays, minus saturdays and sundays.
The dates are on a table (main_table) and the holidays are on another table (holidays_table). This table has the holidays of a local country and US holidays. When only one country (1 or 2) is considered, the result is OK, but when both countries have to be considered (1 and 2), the result is wrong. The code is below:
CREATE OR REPLACE function F_NUMBEROFDAYS
( p_Countries in varchar2
) return integer
is
v_return integer;
begin
begin
select
( select sum( case when (to_number(to_char(DATE1+(level-1), 'd')) not in (1,7))
then 1 else 0 end
from dual connect by level <= (DATE2 - DATE1)+1 )
- ( select count(*)
from holidays_table
where HOLIDAY_DATE between DATE1 and DATE2
and to_number(to_char(HOLIDAY_DATE,'d')) not in (1,7)
and COUNTRY_PK IN -- Numeric field
decode (p_Countries,
'1' , 1 ,
'2' , 2 ,
*'1,2', ???? , -- PLEASE, HOW CAN I SOLVE THIS ???*
1)
) cnt
into v_return
from main_table;
return v_return;
end;
exception
when OTHERS then
return -1;
end F_NUMBEROFDAYS;
show errors;
Thanks in advance
Edited by: user634269 on Jul 10, 2009 8:46 AM
Edited by: user634269 on Jul 10, 2009 8:55 AM

Answer 1

Also;
WITH subq AS (
   SELECT CASE WHEN instr(p_countries,'1') >0 THEN 1 END val FROM dual UNION ALL
   SELECT CASE WHEN instr(p_countries,'2') >0 THEN 2 END val FROM dual)
SELECT (SELECT SUM(CASE
                       WHEN (to_number(to_char(date1 + (LEVEL - 1), 'd')) NOT IN
                            (1, 7)) THEN
                        1
                       ELSE
                        0
                    END)
        FROM dual
        CONNECT BY LEVEL <= (date2 - date1) + 1) -
       (SELECT COUNT(*)
        FROM holidays_table, subq
        WHERE holiday_date BETWEEN date1 AND date2
        AND to_number(to_char(holiday_date, 'd')) NOT IN (1, 7)
        AND country_pk = subq.val) cnt
INTO v_return
FROM main_table;Edited by: MScallion on Jul 10, 2009 10:24 AM
Replaced bind with p_countries.