> How do you extract postgresql column names, types and comments in tabular 
> form,
> using an SQL command?. I know they are stored in one of the system tables, but
> I don't know which.

- Table names are in pg_class

- Column names are in pg_attribute, associated to pg_class via
   "where pg_attribute.attrelid = pg_class.oid"

- Comments are in pg_description...  There seem to be links to both
  pg_class and pg_attribute

- Type info is in pg_type, associated to pg_attribute via "atttypid"

There are attributes that you normally don't see, and "dropped"
attributes still exist in pg_attribute, so things are a tad more
complex than what I have said, but the above 4 tables should provide
you all you need...
-- 
select 'cbbrowne' || '@' || 'acm.org';
http://linuxdatabases.info/info/slony.html
Never criticize anybody until  you have walked  a mile in their shoes,
because by that time you will be a mile away and have their shoes.
-- email sig, Brian Servis

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