Replace NULL values from PIVOT query

Question

Hi,
I'm querying a table for sales, for some values, when now columns, the finish with a null value. How can I handle these values as 0 (zeros).
WITH PIVOT_DATA AS (
SELECT S.ZONE_CODE,Z.ZONE_NAME,S.YEAR,S.PERIOD,S.SALES
FROM STAT_TABLE_SALES VTA
JOIN ZONES Z ON S.COMP=Z.COMP AND S.ZONE_CODE=Z.ZONE_CODE
WHERE S.COMP = '001'
AND S.BRAND_CODE = '001'
SELECT *
FROM PIVOT_DATA
PIVOT(
SUM(SALES) FOR (YEAR,PERIOD) IN ((2009,1),
(2009,2),
(2009,3),
(2009,4),
(2009,5),
(2009,6),
(2009,7),
(2009,8),
(2009,9),
(2009,10),
(2009,11),
(2009,12),
(2010,1),
(2010,2),
(2010,3),
(2010,4),
(2010,5),
(2010,6),
(2010,7))
ORDER BY 14 DESC NULLS LAST;
This query returns the following:
COD_ZONA NOM_ZONA 2009_1 2009_2 2009_3
01 YEDUSIJH. 1382367.75 1559943.27 1441279.64
02 DO,ASKAK 711897.82 865854.05 1583232.3
03 ASDFG 130443.03 205409.84 178633.69
04 OSOIDSD 320118.32 439008.83 409251.18
05 ODFSDF 300908.21 276301.59 260188.53
06 CH 242749.65 325196.71 464938.9
07 SOA 610312.31 606312.93 754569.82
08 SAN 89426.8 81360.04 61649.27
09 YP 284487.79 328281.31 267210.85
10 TC 87043.28 158594.43 85195.8
11 BAGNN 76778.78 68180.76 118530.04
12 CRTS 122023.7 143442.21 134744.85
13 OCC 209992.79 196477.03 185222.14
14 IDLB
15 YA 23870.41 4137.33 16660.53
**These are not all the columns and rows, but this is a piece of what it returns.
How can I replace these NULLS with 0(zeros).

Answer 1

Still not sure why nvl shouldn't suit your needs:
SQL> select ename, nvl (clerk_20, 0) clerk_20, nvl (sal_30, 0) sal_30
  from emp pivot (sum (sal)
           for (job, deptno)
           in ( ('CLERK', 20) clerk_20, ('SALESMAN', 30) sal_30))
ENAME             CLERK_20          SAL_30
WARD                     0            1250
JONES                    0               0
TURNER                   0            1500
ADAMS                 1100               0
ALLEN                    0            1600
SMITH                  800               0
CLARK                    0               0
KING                     0               0
BLAKE                    0               0
JAMES                    0               0
FORD                     0               0
SCOTT                    0               0
MARTIN                   0            1250
MILLER                   0               0
14 rows selected.