how to capture the error when RID value not in the table (pl/sql question)

I have the following code in a pl/sql procedure (oracle 9i), which is called
a lot.

-- RID is PK column on table Customers
-- p_name   is a passed-in parameter
-- p_CustomerRID  is a passed-in parameter
 
   SAVEPOINT sp123;

    UPDATE Customers
    SET Name = p_name
    WHERE RID = p_CustomerRID;

   IF SQL%ROWCOUNT > 1 THEN
      ROLLBACK WORK TO SAVEPOINT sp123;
      RaiseError.TooManyUpdates('Customers');
   ELSIF SQL%ROWCOUNT = 0 THEN
      RaiseError.NoRecordUpdated('Customers');
   END IF;

The code works fine now. But I would to change the update sql to

      UPDATE Customers
      SET Name = p_name
      WHERE RID = p_CustomerRID
      AND Name != p_name;

to avoid unnecessary redo writing.  But if I check SQL%ROWCOUNT for this new
query and get 0, I would not know if it is due to a non-exist RID (Which I
want to capture this situation) or simply p_name already exists for that
RID.  Is there a better way of doing this kind of thing, minimize redo
writing and capture the error the same time with only one sql run?

TIA.

Guang


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