Обсуждение: Drop Cascade of Domains

I have a table which contains three
columns of domain X.

If I drop the domain X with cascade,
the table remains with no columns.

Is this the proper behaviour?

It seems to me that any action which
results in an invalid object should be
forbidden.  On the other hand, with
alter table working well, I am loathe
to argue a table with no columns is
an invalid argument.

Is there a previous rule on this issue?

--elein

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elein writes:

> It seems to me that any action which
> results in an invalid object should be
> forbidden.  On the other hand, with
> alter table working well, I am loathe
> to argue a table with no columns is
> an invalid argument.

While not allowed according to the SQL standard, we have decided that
tables with zero columns are valid, and the behavior of all commands and
side effects has been aligned with that.

--
Peter Eisentraut   peter_e@gmx.net

elein <elein@varlena.com> writes:
> I have a table which contains three
> columns of domain X.
> If I drop the domain X with cascade,
> the table remains with no columns.
> Is this the proper behaviour?

Yes, we agreed some time ago that that is the best thing to do.

            regards, tom lane