Query using DBLink

Question

Iam using 10.1.0.2.0 Version . Both table structure is same in both DB .I want to do both update
and insert based on my below query
Source: DB - Different Server
Table 1: src_Tab_A
Columns : c_id,seq, code,type,s_code [has composite pk c_id,seq]
Table 2: Src_TAb_B
Columns : c_id,seq,lan,code,name,s_code [has composite pk c_id,seq,lan]
target: DB
Table 1: tgt_Tab_A
Columns : c_id,seq, code,type,s_code [has composite pk c_id,seq]
Table 2: tgt_TAb_B
Columns : c_id,seq,lan,code,name,s_code [has composite pk c_id,seq,lan]
SELECT a.C_ID, a.S_CODE, a.CODE, a.SEQ,a.type
FROM <schema>.src_Tab_A@<DBLINK> a
WHERE a.C_ID = 20
AND a.TYPE = 'S'
AND Exists( SELECT C_ID, S_CODE, CODE, SEQ, TYPE
FROM tgt_Tab_A b
WHERE b.C_ID = a.c_id
AND b.SEQ = a.seq)
This query is fetching the matching records . But i want to fetch based on ( b.s_code <> a.s_code or b.code <> a.code )
For example ,
SELECT a.C_ID, a.S_CODE, a.CODE, a.SEQ,a.type
FROM <schema>.src_Tab_A@<DBLINK> a
WHERE a.C_ID = 20
AND a.TYPE = 'S'
AND Exists( SELECT C_ID, S_CODE, CODE, SEQ, TYPE
FROM tgt_Tab_A b
WHERE (b.C_ID = a.c_id
AND b.SEQ = a.seq)
**AND b.s_code <> a.s_code OR b.code <> a.code*)*
But its not giving the exact output what i want ...
similarly i want to fetch it from src_tab_b and tgt_tab_b based on not matching records of name and code values..
How can i do this ... any suggestions for me ...

Answer 1

Source DB
SRC_Tab_A               
C_ID     S_CODE     CODE     SEQ
21     005     005     5
21          006     6
21     007     007     7
21     008     008     8
21     009     009     9
SRC_Tab_B                         
C_ID     S_CODE     LAN     CODE     SEQ     NAME
21     005     EN     005     5     Manufacturer
21          EN     006     6     Formulation Originator
21     007     EN     007     7     Registration Holder
21     008     EN     008     8     Active Ingredient Supplier
21     009     EN     009     9     Agreement Partner
Target DB
TGT_Tab_A               
C_ID     S_CODE     CODE     SEQ
21     005     005     5
21     006     006     6
21     007     007     7
21     008     008     8
21     009     009     9
TGT_Tab_B                         
C_ID     S_CODE     LAN     CODE     SEQ     NAME
21     005     EN     005     5     Manufacturer
21     006     EN     006     6     Formulation originator
21     007     EN     007     7     MA Holder/Sponsor
21     008     EN     008     8     Active ingredient supplier
21     009     EN     009     9     Agreement partner
I want to compare SRC_Tab_A and TGT_Tab_A, SRC_Tab_B and TGT_Tab_B.. if there is any difference in s_code or
name then it should display those difference records
The output should be like this ,
SRC_Tab_A               
21          006     6
SRC_Tab_B                         
21     007     EN     007     7     Registration Holder
Please help me to solve this ...