Re: bug report: pg_dump does not use CASCADE in DROP - Mailing list pgsql-bugs

Tom Lane wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Tom Lane wrote:
> >> The correct use of dependency information would be to sort the DROPs
> >> into an order that should succeed *without* CASCADE.  (This will
> >> actually happen for free AIUI, once pg_dump uses dependency info fully.
> >> DROPping in the reverse of a safe creation order should work.)
>
> > Right, but how do you drop two tables that REFERENCE each other?  Seems
> > you have to use CASCADE in that case.
>
> Nope.  It's still the inverse problem of pg_dump.  pg_dump would have to
> dump such a construction with CREATE TABLEs followed by ALTER TABLE ADD
> FOREIGN KEYs, right?  So the DROPs issued in reverse order are ALTER
> TABLE DROP CONSTRAINTs followed by DROP TABLE.

Yep.

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