Use a control for a column nvl non-zero trigger

Hi gurus,

Appreciate your help here,

I was told to use a control nvl for a column not null, am looking at here can we use NVL fucntion for a (ES_NUMBER) column not null or something wrong...

Please notify.


Sea of ESCR

ES_NUMBER not null VARCHAR2 (16).

ID NUMBER (8).

FULL_FALG VARCHAR2 (1)

sample data:

ES_NUMBERfull_flagID
67156044950THERE1
484002064992N6
22220000N3
601101704712148N4
670162973THERE5
670163740THERE6
670163740THERE6
670170399THERE6


CREATE OR REPLACE TRIGGER prod.merpiggytrig

BEFORE INSERT OR UPDATE ON PROD. SEA
FOR EACH LINE

DECLARE
bParam BOOLEAN: = FALSE;

BEGIN

IF THE INSERTION
THEN
bParam: = TRUE;
ELSIF UPDATE
THEN
IF NVL(:NEW.ES_NUMBER,' ') <>nvl (: OLD.ES_NUMBER,' ')

THEN
bParam: = TRUE;
ON THE OTHER
IF NVL (: OLD.ES_NUMBER,' ') <>: NEW.ES_NUMBER,' ')
THEN
IF (: NEW.ID = 6 AND)
NVL(:OLD.) FULL_FLAG, 'n') <>nvl(:NEW.) FULL_FLAG, 'N') AND NVL(:NEW.) (FULL_FLAG, 'n') <>'n') THEN
bParam: = FALSE;
ON THE OTHER
bParam: = TRUE;
END IF;
END IF;

END IF;
END IF;

IF bParam

THEN
UPDATE prod.ter SET piggy_flag = 'Y '.
WHERE mer_id =: new.mer_id
and NVL(piggy_flag,'N') = 'n';
END IF;

< < TRIGGER_EXIT > >
NULL;

END;
/

Hello

978485 wrote:

Yes es_number non-null VARCHAR2 (16).

In fact, a question that we can use nvl for not null column.

Yes. Was there no problem when you tried?

The only restriction on NVL is that both arguments must be the same data type (or close).  There is no restriction on arguments is NULL or not.  Neither the argument must be NULL.

Tags: Database

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