Re: almost there on a design

so make a column in EACH table,
that references the primary key of the other table,
then set one of the constraints deferrable,
write the table with that one first - inside of a transaction

Is that it?


3/3/2003 4:18:43 PM, Stephan Szabo <sszabo@megazone23.bigpanda.com> wrote:

>
>On Mon, 3 Mar 2003, Dennis Gearon wrote:
>
>> Is it possible to do 'cross constraints' between two tables using a transaction and:
>>
>>     SET�CONSTRAINTS�ALL�DEFERRED;
>>
>> Or making both tables INITIALLY DEFERRED?
>
>You make constraints INITIALLY DEFERRED, but yes in general, although
>technically you only need to make one of the constraints deferred unless
>you don't want to constraint the order that the rows are made.
>
>PostgreSQL doesn't support deferred check constraints, and in general the
>deferred trigger stuff isn't really meant for end-user use (it's really
>there for supporting foreign keys), so you'll probably want to make the
>foreign key from usremailaddrs->usrs be initially deferred and insert the
>usremailaddrs row first.
>
>
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