Re: Are circular REFERENCES possible ?

Jan,
>     All of this is wrong. If the constraints are  defined  to  be
>     INITIALLY  DEFERRED,  all  you  have to do is to wrap all the
>     changes that put the database into a  temporary  inconsistent
>     state  into  a  transaction. What is a good idea and strongly
>     advised anyway.
> 
>     DEFERRED means, that the  consistency  WRT  the  foreign  key
>     constratins  will  be  checked  at COMMIT time instead of the
>     actual statement. So if you

Hmmm... sounds interesting.  Can this be done through functions?  I.E.,
if I put the INSERT/INSERT/UPDATE operation inside a function, does it
automatically wait until the function completes before checking
constraints?

>     Josh, maybe you should buy a newer SQL-bo... :-)
> 
>     Got ya (LOL)!

Zap!  Ouch.  ;-)

> 
>     The point is that we based our implementation of foreign keys
>     on the SQL3 specs. DEFERRED is not in SQL-92 AFAIK.
> 

Know a good SQL3 book?  I bought O'Reilly's SQL In A Nutshell for that,
but the book has numerous omissions and a few mistakes.

-Josh Berkus

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