Re: concurent updates

On Thu, 26 Jul 2001, Steve SAUTETNER wrote:

> hi everybody !
>
> I've got a little problem when updating a primary key in two table
> where the primary key of the one is a foreign key from the second :
>
> here are the 2 tables :
>
> create table table1 (id int primary key, col1 int);
> create table table2 (id int primary key references table1(id), col2 int);
>
> and the 2 updates :
>
> 1) update table2 set id = 1001 where id = 1;
> 2) update table1 set id = 1001 where id = 1;
>
> i can't execute them separately because of an integrity constraint
> violation.
> i've got the same error in a BEGIN / COMMIT block containing the updates.
>
> Does any one see how two help me ?

Either on update cascade (as suggested by someone else) or making the
constraint deferred in which case you can use a begin...commit block.