Procedure to update the table records

Question

I have to write a procedure to update the existing records.
I have one staging table and one decode table.
staging table is obtained from a interface with cross join of two tables X1 and X2 and
lookup with DECODE table.
DECODE
ITEM_ID ITEM_CODE STORE_ID STORE_CODE
101 C 7 77
100 A
100 B
In this table there is relation between item_id and item_code AND
store_id and store_code. Items and stores have no relationship here. Simply we insert values of both side by side.
Initial STAGING table
SNO RNO SCODE RCODE DECODE_STATUS
101 8 C NP
101 6 C NP
101 7 C 77 P
100 8 A NP
100 6 A NP
100 7 A 77 P
100 8 B NP
100 6 B NP
100 7 B 77 P
Joins:
SNO=ITEM_ID
RNO=STORE_ID
Now I want to update this according to my new decode where NP record will be updated with their new RCODE values
DECODE table now is
ITEM_ID ITEM_CODE STORE_ID STORE_CODE
101 C 8 88
100 A 7 77
100 B 6 66
Now I need my staging table with RCODE values corresponing to DECODE table.
My expected STAGING table.
SNO RNO SCODE RCODE DECODE_STATUS
101 8 C 88 NP
101 6 C 66 NP
101 7 C 77 P
100 8 A 88 NP
100 6 A 66 NP
100 7 A 77 P
100 8 B 88 NP
100 6 B 66 NP
100 7 B 77 P
Please help me to do this ...I have tried with interface where I kept source and target table same staging table and used DECODE for lookup but I didnt get the expected result.

Answer 1

Hi Chattar ,
It clearly seems that issue is with Primary keys.
As you have said about the decode table "In this table there is relation between item_id and item_code AND store_id and store_code. Items and stores have no relationship here. Simply we insert values of both side by side."
It seems your final update query should be like this :
update staging1 T
set (T.rcode, T.scode)
=
Select
(select store_code from decode where store_id = T.RNO ) ,
(SELECT ITEM_CODe from decode where ITEM_id = T.SNO)
from dual
) where T.decode_status = 'NP';
If what i have said is right , then you can implement the same using an interface too But first you should decide the Key columns on the target table.
Hope it solves the issue.
Edited by: user8427112 on Sep 22, 2012 6:48 AM