Re: Can I have check and referential constraint on same column? -- MIDRANGE-L

Rick,

To check my answer I did a small test:

ALTER TABLE MyLib/File1
ADD Constraint FK_CardType
FOREIGN KEY (CardType)
REFERENCES MyLib/File2 (CardType) ;

ALTER TABLE File1 ADD CHECK (CardType <> 9 ) ;

No problem in creating both constraints. Even if there is a CARDTYPE 9 in
File2, I can't insert a CARDTYPE 9 record in File1. The system returns
CPF502F (Check constraint violation).

Did not check what happens the CHECK constraint is created before the
foreign key...

HTH,
Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries

On Thu, May 20, 2010 at 1:35 PM, <Rick.Chevalier@xxxxxxxxxxxxxxx> wrote:

That's the impression I got from the documentation. It didn't explicitly
say it couldn't be done, but I was wondering how it would work. If a value
passes one constraint but fails another is the record added or not? I'm
about to give it a try.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:
midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Luis Rodriguez
Sent: Thursday, May 20, 2010 11:30 AM
To: Midrange Systems Technical Discussion
Subject: Re: Can I have check and referential constraint on same column?

AFAIK, yes.

Regards,

Luis Rodriguez
IBM Certified Systems Expert - eServer i5 iSeries

On Thu, May 20, 2010 at 11:22 AM, <Rick.Chevalier@xxxxxxxxxxxxxxx> wrote:

I have come across a situation where I think I need both a check
constraint and a referential constraint on the same column to handle
different situations.

When a row is inserted the default value for the status column will be

'N'.

When the information has been validated it will change to 'V'. This
is my current check constraint.

If the validation is overridden an override code can be placed into
the status column from an exception table. This is my referential

constraint.

I have thought about adding the check values to the exception table
and excluding them from the exception prompt but I would prefer to
handle it without doing that if possible. If I can't have both
constraints on the status column this is probably what I will do.

Rick Chevalier
IT Software Solutions - Loan Servicing

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