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Re: InstantDB: Foreign keys in alter table


Lalitha

Thanks for pointing this out. The "add foreign key" part of "alter table"
has not yet been implemented.

Regards

Pete

--

Peter Hearty                         peter.hearty@lutris.com
Lutris Technologies (UK)        http://www.lutris.com
----- Original Message -----
From: "Lalitha Chinthamani" <lchinthamani@oresis.com>
To: <instantDB@enhydra.org>
Sent: Friday, September 15, 2000 11:10 PM
Subject: InstantDB: Foreign keys in alter table


> Hi,
>
> I have two tables namely userTable and userProfile. The userTable is the
> parent and userProfile is the child table. I create the tables using the
> command:
>
>     a) create table userTable (handle INT unique primary key, name varchar
> (20))
>
>      -- This is sucessful. The uniqueness is checked during row additions.
>
>     b) create table userProfile (userHandle INT foreign key references
> userTable(handle), profileHandle INT )
>
> Now InstantDB checks properly whenever a new row is added in the
> userProfile, to make sure that particular key exist in userTable.  Checks
> are also done when I do a delete from userProfile to make sure that key
not
> exist in UserProfile. So, the reference checks work sweet when I create
> primary and foreign keys during create table.
> However, the same stuff does not work when I create foreign key using
alter
> table. No referential checks are done.
>
>    a) create table userTable (handle INT unique primary key, name varchar
> (20))
>
>    b) create table userProfile (userHandle INT, profileHandle INT)
>        alter table userProfile add foreign key (userHandle) references
> userTable (handle)
>
> This way of creating foreign key does not check for referential integrity.
> Is there anything I am doing wrong here? Is this a known problem? I am
kind
> of new to SQL and instantdb.
>
> Thanks,
> Lalitha
>
>
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