Update other items with the same value when when column contains Y

Question

CREATE TABLE TEST
   (     "QUATINTY" NUMBER(17,2),
     "AMOUNT" NUMBER(17,2),
     "ERRORRED" VARCHAR2(16 BYTE),
     "PO" VARCHAR2(12 BYTE),
     "LINE" VARCHAR2(10 BYTE),
     "SEQ" VARCHAR2(14 BYTE),
     "INVOICE" VARCHAR2(16 BYTE)
Insert into TEST (PO,QUATINTY,AMOUNT,ERRORRED,LINE,SEQ,INVOICE) values ('123',5,50,'Y','1','1','inv1');
Insert into TEST (PO,QUATINTY,AMOUNT,ERRORRED,LINE,SEQ,INVOICE) values ('123',5,50,null,'1','2','inv1');
Insert into TEST (PO,QUATINTY,AMOUNT,ERRORRED,LINE,SEQ,INVOICE) values ('125',5,50,null,'1','1','inv2');
Insert into TEST (PO,QUATINTY,AMOUNT,ERRORRED,LINE,SEQ,INVOICE) values ('125',4,50,null,'1','2','inv2');If you notice by the table above what im trying to acomplish is update the errorred column with 'Y' if any of the po and invoice are the same and have a 'Y' on the errored column.
in other words, i should end up with 'Y' in the errorred column for INV1.
Can someone point me in the right direction i cant for the life of me figuered this one out.

Answer 1

Hi,
Here's one way:
UPDATE     test
SET     errorred     = 'Y'
WHERE     NVL (errorred, 'N') != 'Y'
AND     (po, invoice)          IN (
                          SELECT  po, invoice
                     FROM      test
                     WHERE      errorred  = 'Y'
;This assumes that po and invoice are not NULL. If either column can be NULL, then the solution might be a little messier, depending on the results you want, but only a little. Post some sample data (with NULLs) that shows what kinds of situations you need to handle, and the results from that sample data.