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Complex Update SQL

780828Aug 4 2010 — edited Aug 9 2010
Oracle Version: 10g

I am trying to write an update statement based on chain of items. The table has approximately 2M records. Any help constructing this SQL is appreciated. Thanks!

The items in the table will not be in order. Just use this as sample..

ItemNo1 changed to ItemNo2
ItemNo4 changed to ItemNo3
ItemNo5 changed to ItemNo2
ItemNo6 changed to ItemNo7
ItemNo7 changed to ItemNo8
ItemNo2 changed to ItemNo3

Records 1, 2, 3, 6 should be updated as Chain1 and Records 4 and 5 should be updated as Chain2.

Please see the scripts and sample data below. 
  CREATE TABLE "AVLTSB_SUB" 
   (	"CHAIN_ID" NUMBER NOT NULL ENABLE, 
	"ITM_NO" VARCHAR2(30 BYTE) NOT NULL ENABLE, 
	"SUB_ITM_NO" VARCHAR2(30 BYTE) NOT NULL ENABLE, 
	"UPD_TS" TIMESTAMP (6) DEFAULT SYSTIMESTAMP NOT NULL ENABLE, 
	"ORD_IND" NUMBER(*,0) DEFAULT 0 NOT NULL ENABLE, 
	"EFF_DT" DATE NOT NULL ENABLE, 
	"ONE_WY_IND" NUMBER(*,0) DEFAULT 0 NOT NULL ENABLE
   ) 


Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-120','009009PM-121',to_timestamp('22-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('22-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-121','009009PM-122',to_timestamp('22-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('22-JUL-10','DD-MON-RR'),0);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-123','009009PM-122',to_timestamp('22-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('22-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-124','009009PM-125',to_timestamp('22-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('22-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-125','009009PM-126',to_timestamp('22-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('22-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-126','009009PM-127',to_timestamp('22-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('22-JUL-10','DD-MON-RR'),0);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-127','009009PM-128',to_timestamp('28-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('28-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-128','009009PM-129',to_timestamp('28-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('28-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-130','009009PM-131',to_timestamp('28-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('28-JUL-10','DD-MON-RR'),0);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-131','009009PM-132',to_timestamp('28-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('28-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-132','009009PM-133',to_timestamp('28-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('28-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'009009PM-134','009009PM-135',to_timestamp('28-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('28-JUL-10','DD-MON-RR'),1);
Insert into AVLTSB_SUB (CHAIN_ID,ITM_NO,SUB_ITM_NO,UPD_TS,EFF_DT,ONE_WY_IND) values (0,'0030033-8602','0030033-8604',to_timestamp('22-JUL-10 12.00.00.000000000 AM','DD-MON-RR HH.MI.SS.FF AM'),to_date('22-JUL-10','DD-MON-RR'),1);

Expected Output after updating the Chain_ID:

select chain_id, itm_no, sub_itm_no from avltsb_sub

1	009009PM-120	009009PM-121
1	009009PM-121	009009PM-122
1	009009PM-123	009009PM-122
2	009009PM-124	009009PM-125
2	009009PM-125	009009PM-126
2	009009PM-126	009009PM-127
2	009009PM-127	009009PM-128
2	009009PM-128	009009PM-129
4	009009PM-130	009009PM-131
4	009009PM-131	009009PM-132
4	009009PM-132	009009PM-133
5	009009PM-134	009009PM-135
6	0030033-8602	0030033-8604
This post has been answered by Aketi Jyuuzou on Aug 4 2010
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Locked on Sep 6 2010
Added on Aug 4 2010
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