Return 0 for months with title which doesn't contain any transaction

Question

SELECT decode(c.ORGANIZATION_CODE,'MP','Main Plant','MP2','Sub Plant','NA') Organization,a.ORGANIZATION_ID ,A.INVENTORY_ITEM_ID,b.DESCRIPTION,
TO_CHAR(A.TRANSACTION_DATE,'MON') MONTHH,ROUND(ABS(SUM(A.TRANSACTION_QUANTITY)),2) TRAN_QTY
FROM MTL_MATERIAL_TRANSACTIONS A,mtl_system_items b,mtl_parameters c
WHERE A.TRANSACTION_TYPE_ID=35
AND A.INVENTORY_ITEM_ID IN (12041,12043,12037,12039,12046)
and a.INVENTORY_ITEM_ID=b.INVENTORY_ITEM_ID
and a.ORGANIZATION_ID=b.ORGANIZATION_ID
and a.ORGANIZATION_ID=c.ORGANIZATION_ID
GROUP BY c.ORGANIZATION_CODE, A.ORGANIZATION_ID,A.INVENTORY_ITEM_ID,b.DESCRIPTION, TO_CHAR(A.TRANSACTION_DATE,'MON')
ORDER BY TO_DATE(MONTHH,'MON')
Above query return Data of Jan,Feb, Mar, Apr,May,Jun because we have only opened six months. i want to show all months upto DEC even not opened with 0 value.
e.g
Jan 100
Feb 200
mar 330
apr 150
may 140
jun 125
july 0
aug 0
sep 0
Dec 0

Answer 1

Maybe something like this:
SQL> set feedback on
SQL> WITH test_tab AS (SELECT   'Jan 2009' month_name, 100 amount FROM DUAL
  2                    UNION ALL
  3                    SELECT   'Feb 2009', 200 FROM DUAL
  4                    UNION ALL
  5                    SELECT   'Mar 2009', 330 FROM DUAL
  6                    UNION ALL
  7                    SELECT   'apr 2009', 150 FROM DUAL
  8                    UNION ALL
  9                    SELECT   'may 2009', 140 FROM DUAL
10                    UNION ALL
11                    SELECT   'jun 2009', 125 FROM DUAL)
12  -- end of test_data
13  SELECT   *
14    FROM   TEST_TAB
15  /
MONTH_NA     AMOUNT
Jan 2009        100
Feb 2009        200
Mar 2009        330
apr 2009        150
may 2009        140
jun 2009        125
6 rows selected.
SQL> WITH test_tab AS (SELECT   'Jan 2009' month_name, 100 amount FROM DUAL
  2                    UNION ALL
  3                    SELECT   'Feb 2009', 200 FROM DUAL
  4                    UNION ALL
  5                    SELECT   'Mar 2009', 330 FROM DUAL
  6                    UNION ALL
  7                    SELECT   'apr 2009', 150 FROM DUAL
  8                    UNION ALL
  9                    SELECT   'may 2009', 140 FROM DUAL
10                    UNION ALL
11                    SELECT   'jun 2009', 125 FROM DUAL)
12                    -- end of test_data
13    SELECT   TO_CHAR (b1.derived_months, 'MON') month_name,
14             NVL (amount, 0) amount
15      FROM   test_tab a1,
16             (    SELECT   ADD_MONTHS (TRUNC (SYSDATE, 'YYYY'), LEVEL - 1)
17                              derived_months
18                    FROM   DUAL
19              CONNECT BY   LEVEL <= 12) b1
20     WHERE   UPPER (a1.month_name(+)) = TO_CHAR (b1.derived_months, 'MON YYYY
21  ORDER BY   b1.derived_months
22  /
MONTH_NAME       AMOUNT
JAN                 100
FEB                 200
MAR                 330
APR                 150
MAY                 140
JUN                 125
JUL                   0
AUG                   0
SEP                   0
OCT                   0
NOV                   0
MONTH_NAME       AMOUNT
DEC                   0
12 rows selected.
SQL>Regards,
Jo