How can I use a function in a Case or IIF?

Question

Hi everyone,
I'm trying to use an Intersect function in a IIF function, but I have this error: Syntax error input MDX query on line 6 at token "="
Here I'm trying to intersect some sets, and after that I try to check if the result is equal to [2012].
If I'm trying to have a simple check, like IIF ([2012]=[2012],[2012],[2013]), it's working.
But I need to put somehow a function there. Maybe not to use the IIF or CASE function..
This is my query:
SELECT
[Account].[1234],[Account].[4566]
} DIMENSION PROPERTIES MEMBER_ALIAS, GEN_NUMBER, MEMBER_ALIAS, GEN_NUMBER ON COLUMNS,
IIF( Intersect  ( {[2012],[2013]}, {[2012]} )=[2012], [2012], [2013] )
} DIMENSION PROPERTIES MEMBER_ALIAS, GEN_NUMBER ON ROWS
FROM [MyCUBE].[main]
WHERE ([Jan])
CELL PROPERTIES VALUE
Thank you a lot!

Answer 1

I have the function:
CREATE OR REPLACE FUNCTION verificar_NIF (nif varchar2) return boolean as
l_check_digit constant varchar2(23) := 'TRWAGMYFPDXBNJZSQVHLCKE';
l_mod number;
l_result varchar2(1);
l_return boolean := false;
begin
l_mod := mod(substr(nif, 1, 8), 23);
l_result := substr(l_check_digit, l_mod+1, 1);
if l_result = substr(nif, 1, 9) then
l_return := true;
end if;
return l_return;
end;
And I have the table:
CREATE TABLE Clients (
     id_client NUMBER(5) PRIMARY KEY,
     nif VARCHAR2(9),
     cog1 VARCHAR2(50) NOT NULL,
     cog2 VARCHAR2(50) NOT NULL,
     nom VARCHAR2(50) NOT NULL,
     adre VARCHAR2(50) NOT NULL,
     Poblacio VARCHAR2(40) NOT NULL,
     CONSTRAINT err_NIF CHECK ( verificar_NIF(nif)=true )
I want the var nif to have a concert value. It is correct to check in that way?