How to ignore nulls in analytic functions ( row_number() and count())

Question

how to ignore nulls in analytic functions ( row_number() and count())

Answer 1

Iam attaching test data can any one help me please
thanks in advanceeeee
CREATE TABLE TEMP_table
ACCTNUM NUMBER,
l_DATE TIMESTAMP(3),
CODE VARCHAR2(35 BYTE),
VENDOR VARCHAR2(35 BYTE)
insert into temp_table values (1,sysdate+1/60,'bso','v1');
insert into temp_table values (1,sysdate+2/60,'bsof','v1');
insert into temp_table values (1,sysdate+3/60,'bsof','v2');
insert into temp_table values (1,sysdate+4/60,'','v1');
ian executing this my ;
SELECT acctnum,l_date,vendor,code_1,
       CASE
         WHEN code = 'bsof'
          AND COUNT (DISTINCT code) OVER (PARTITION BY acctnum, vendor) > 1
          AND row_number () OVER (PARTITION BY acctnum, vendor ORDER BY vendor, l_date) != 1
         THEN 'yes'
       ELSE 'no' END result
  FROM  (select  acctnum,l_date,vendor, code code_1, case when code IN ('bso', 'bsof') then code
  else null end code   from  TEMP_TABLE
ORDER BY acctnum ,l_date);
my result :
1    3/23/2011 5:24:34.000 PM    v1    bso    no
1    3/23/2011 5:48:36.000 PM    v1    bsof    yes
1    3/23/2011 6:36:41.000 PM    v1    bsof    yes
1    3/24/2011 11:55:53.000 AM    v1        no
1    3/23/2011 6:12:38.000 PM    v2    bsof    no
I need to eliminate nulls  in top query not in inner query (not using where condition in inner query)
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