really novice with Postgres !

Hi everybody,

I have some more questions :
Is there a SQL command to
  - test if a database exists
  - test if a table exists
  - get the list of the tables of a database
  - get the structure (list of fields) of a table

Thanks in advance

--
Jean MAURICE
Grenoble - France - Europe
www.j-maurice.fr
www.atoutfox.org
www.aedtf.org