... but the key NULL does not exist on the table a, but it should!!!
Adib.
Alain Del Giust wrote:
> Nope
>
> insert into b values ('BBB',null);
> here:
> BBB is PK of table b
> null is FK of table b referencing table a
>
> for example
> insert into b values ('BBB','aaa');
> works well
>
> Alain
>
> ----- Original Message -----
> From: "Rance Hall" <[EMAIL PROTECTED]>
> To: "Alain Del Giust" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Sent: Tuesday, April 09, 2002 6:25 PM
> Subject: RE: mySQL and innoDB
>
>
> The "insert into b values ('BBB', NULL)" statement should fail under the
> conditions you describe, BBB was not inserted into the A table, and
> therefore the foreign key constraint fails as it should.
>
>
> Rance Hall
> 308.238.2455
> Internal Office Extensions: 2455 or 6655
> PC Programmer, The Buckle, Inc.
> [EMAIL PROTECTED]
>
>
> -----Original Message-----
> From: Alain Del Giust [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, April 09, 2002 11:28 AM
> To: [EMAIL PROTECTED]
> Subject: mySQL and innoDB
>
>
> Hi all,
>
> I am pretty new to mySQL actually I started yesterday.
> mySQL with innoDB handles integrity constraints.
> I tried :
>
> create table a (
> id varchar(3) not null,
> primary key(id) )
> TYPE=INNODB;
>
> insert into a values ('aaa');
>
> create table b (
> id varchar(3) not null,
> a_id varchar(3),
> index idx_b_a_id (a_id), foreign key (a_id) references a (id),
> primary key(id) )
> TYPE=INNODB;
>
> insert into b values ('AAA','aaa');
>
> insert into b values ('BBB',null);
>
> the last statment doesn't work ... ERROR 1216: Cannot add a child row: a
> foreign key constraint fails
>
> I am using mySQL version 3.23.49 (and 4.0.1-alpha) on win2Ksp2
> "mysqld-max --standalone --console"
>
> Thanks,
>
> Alain
>
>
>
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