On Sun, 2 Apr 2006, Grega Bremec wrote:
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Andy Shellam wrote:
| Hi,
|
| Is there an SQL command supported by Postgres to return a list of
| tables in a database?
|
| For example on mySQL, you can connect to a database and issue the
| command SHOW TABLES to bring back a list of tables in that database.
| In PG this throws the error "unknown configuration parameter TABLES.">
Hello, Andy.
Not a command per se, but there are two ways you can obtain this
information, depending on where you're working.
The first option is the backslash commands you can use from f.e. psql
(type \? in a psql prompt to see the full list), where \d will list all
sorts of database objects, \dt can be used specifically for tables.
The other option which you can use from an SQL script is accessing the
system tables pg_class, pg_namespace and pg_tablespace in schema
pg_catalog, using a query similar to those used by the backslash commands:
~ template1=# SELECT c.relname AS table FROM pg_class c
~ LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
~ WHERE n.nspname = 'public'
~ AND c.relkind = 'r';
Substitute 'public' for whatever schema you're interested in or add
other schemas according to your preference. Also, take a look at system
view pg_tables (\d pg_tables).
Also, take a look at the archives, Elein once posted a nice set of views
~ and statements you can use for such purposes.
psql -E will show you all queries that internal commands generate
Hope this helped,
- --
~ Grega Bremec
~ gregab at p0f dot net
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TIP 4: Have you searched our list archives?
http://archives.postgresql.org
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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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
