Question

How to Update a table field matching with another records of same table.

UPDATE XXXRLES
    SET BIZCAT05 = 'S'
    WHERE ( SELECT A.* FROM XXXRLES A, XXXRLES B
                    WHERE
                        A.BIZFLD = B.BIZFLD
                        AND A.BIZOBJ = B.BIZOBJ
                        AND A.BIZRUL = B.BIZRUL
        );

I need to update Field BIZCAT05 by ‘S’ of table XXXRLES if and only if 2 records having the same values for the following 3 Fields as:

BIZFLD 
BIZOBJ
BIZRUL

---

How to make this query?

Answer 1

I’ve assumed that your RDBMS is Oracle after you’ve mentioned ROWID in comment.

UPDATE A SET
    BIZCAT05 = 'S'
FROM XXXRLES A
JOIN XXXRLES B ON
    A.BIZFLD = B.BIZFLD
    AND A.BIZOBJ = B.BIZOBJ
    AND A.BIZRUL = B.BIZRUL
    AND A.ROWID <> B.ROWID

or using exists (which looks clearer, at last for me):

UPDATE A SET
    BIZCAT05 = 'S'
FROM XXXRLES A
WHERE EXISTS (SELECT 1 
    FROM XXXRLES B
    WHERE A.BIZFLD = B.BIZFLD
    AND A.BIZOBJ = B.BIZOBJ
    AND A.BIZRUL = B.BIZRUL
    AND A.ROWID <> B.ROWID
)

Added after comment:

I’m not familiar with DB2 but you can try:

UPDATE XXXRLES A SET
    BIZCAT05 = 'S'
WHERE EXISTS (SELECT 1 
    FROM XXXRLES B
    WHERE A.BIZFLD = B.BIZFLD
    AND A.BIZOBJ = B.BIZOBJ
    AND A.BIZRUL = B.BIZRUL
    AND A.ROWID <> B.ROWID
)