Outer Join not giving correct result

Question

I have two tables=> tab_child_tmp (product_id,region,child_val,mst_product) and
tab_master_tmp (master_product_id,region,master_val)
tab_child_tmp.mst_product is the foreign key referencing tab_master_tmp.master_product_id.
Currently the tables are populated with below values
tab_child_tmp
PRODUCT_ID REGION CHILD_VAL MST_PRODUCT
Arm-01,     CAL,     100,     Arm-Master
Arm-01,     DEL,     222,     Arm-Master
Arm-01,     CHEN,     55,     Arm-Master
Arm-02,     MUM,     69,     Arm-Master
Arm-02,     DEL,     90,     Arm-Master
tab_master_tmp
MST_PRODUCT     REGION     MASTER_VAL
Arm-Master     , CAL,     390
Arm-Master     , DEL,     300
Arm-Master, CHEN,     450
Arm-Master, MUM,     600
Now I want to display the result in the below format
PRODUCT_ID REGION CHILD_VAL MASTER_VAL
1. Arm-01     , CAL, 100,     390
2. Arm-01     , DEL, 222,     300
3. Arm-01     , CHEN, 55,     450
4. Arm-01     , MUM, 0,     600
5. Arm-02     , MUM, 69,     600
6. Arm-02     , DEL, 90,     300
7. Arm-02     , CHEN, 0,     450
8. Arm-02     , CAL, 0,     390
When I am running the below query it is not returning the above 4,7 and 8 rows. Can you please provide the correct sql to get the above desired output
SELECT
a.product_id,
nvl(a.region,b.region) geo,
nvl(a.child_val,0)match_val,
b.master_val
FROM
tab_child_tmp a,
tab_master_tmp b
WHERE
a.mst_product(+) = b.master_product AND
a.region(+) = b.region
Thanks

Answer 1

Hi
Thanks for the reply. Please find below the details.
Oracle Version*
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
CORE     10.2.0.1.0     Production
TNS for Solaris: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
Create Table Script_
create table TAB_CHILD_TMP
PRODUCT_ID VARCHAR2(50),
REGION VARCHAR2(100),
CHILD_VAL NUMBER,
MST_PRODUCT VARCHAR2(50)
create table TAB_MASTER_TMP
MST_PRODUCT VARCHAR2(50),
REGION VARCHAR2(100),
MASTER_VAL NUMBER
Insert Script_
INSERT INTO tab_child_tmp VALUES ('Arm-01','CAL',100,'Arm-Master');
INSERT INTO tab_child_tmp VALUES ('Arm-01','DEL',222,'Arm-Master');
INSERT INTO tab_child_tmp VALUES ('Arm-01','CHEN',55,'Arm-Master');
INSERT INTO tab_child_tmp VALUES ('Arm-Master','MUM',69,'PLC1');
INSERT INTO tab_child_tmp VALUES ('Arm-Master','DEL',90,'PLC1');
INSERT INTO tab_master_tmp VALUES ('Arm-Master','CAL',390);
INSERT INTO tab_master_tmp VALUES ('Arm-Master','DEL',300);
INSERT INTO tab_master_tmp VALUES ('Arm-Master','CHEN',450);
INSERT INTO tab_master_tmp VALUES ('Arm-Master','MUM',600);
INSERT INTO tab_master_tmp VALUES ('PLC1','MUM',199);
INSERT INTO tab_master_tmp VALUES ('PLC1','DEL',299);
INSERT INTO tab_master_tmp VALUES ('PLC1','CHEN',399);
Expected output logic*
Need to display the product value for each region along with the value of master product for the corresponding product and region. If a product doesn't belong to a particular region, but the corresponding master product is, then that value also needs to be displayed for that product and region with child value as zero.
ie. for product Arm-01 there is no record in tab_child_tmp for region "MUM", but it's master product 'Arm-Master' has a record for region 'MUM' in tab master_tmp table. So in ouput there will be a record for product 'Arm-01' and region-'MUM' with child value as 0 and master value as 600.
Expected Output*
PRODUCT_ID ~~~ REG ~~~ CHILD_VAL ~~~ MASTER_VAL
Arm-01 ~~~ CAL ~~~ 100 ~~~ 390
Arm-01 ~~~ DEL ~~~ 222 ~~~ 300
Arm-01 ~~~ CHEN ~~~ 55 ~~~ 450
Arm-01 ~~~ MUM ~~~ 0 ~~~ 600
Arm-MASTER ~~~ MUM ~~~ 69 ~~~ 199
Arm-MASTER ~~~ DEL ~~~ 90 ~~~ 299
Arm-MASTER ~~~ CHEN ~~~ 0 ~~~ 399
Please help