Franco Bruno Borghesi <franco@akyasociados.com.ar> writes:
> Does anyone know if the ansi sql standard defines any way to do this?
> I've seen the DESCRIBE TABLE/INDEX/... or SHOW TABLE/INDEX/... commands
> in other databases, but I don't really know if they are extensions or
> not.
They are extensions (and very nonstandard ones at that). What the SQL
standard provides are standardized views of the system catalogs located
in the INFORMATION_SCHEMA schema. The per-spec way to do this would
be something like
select column_name, data_type
from information_schema.columns
where table_name = 'foo'
order by ordinal_position;
Now Postgres only got around to supporting the INFORMATION_SCHEMA views
in 7.4 (although in principle you could have defined most of these views
earlier, certainly in 7.3). I'm not real sure how many other DBs
support INFORMATION_SCHEMA either ... it may not be all that "standard".
regards, tom lane
