Apart from select statements you can use the following commands on psql
prompt -
\d [NAME] describe table, index, sequence, or view
\d{t|i|s|v|S} [PATTERN] (add "+" for more detail)
list tables/indexes/sequences/views/system tables
\da [PATTERN] list aggregate functions
\db [PATTERN] list tablespaces (add "+" for more detail)
\dc [PATTERN] list conversions
\dC list casts
\dd [PATTERN] show comment for object
\dD [PATTERN] list domains
\df [PATTERN] list functions (add "+" for more detail)
\dg [PATTERN] list groups
\dn [PATTERN] list schemas (add "+" for more detail)
\do [NAME] list operators
\dl list large objects, same as \lo_list
\dp [PATTERN] list table, view, and sequence access privileges
\dT [PATTERN] list data types (add "+" for more detail)
\du [PATTERN] list users
\l list all databases (add "+" for more detail)
\z [PATTERN] list table, view, and sequence access privileges (same as
\dp)
Hope this would answer your query.
>From: Mondi Ravi <ravimondi@wlink.com.np>
>To: pgsql-admin@postgresql.org
>Subject: [ADMIN] how to view all database,tables,users
>Date: Wed, 23 May 2007 14:38:58 +0545
>
>i can't find out command to show all databases,tables,users and
>integrity constraints relationships;
>yours sincerely
>
>
>---------------------------(end of broadcast)---------------------------
>TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
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