list all columns in db

Jonathan Vanasco ha escrito:

Does anyone have a trick to list all columns in a db ?

SELECT *
FROM INFORMATION_SCHEMA.COLUMNS

Jonathan Vanasco wrote:

Does anyone have a trick to list all columns in a db ?

No trickery, just exploit the availability of the SQL standard
information_schema views:

select table_schema, table_name, column_name
from information_schema.columns
where table_schema not in ('pg_catalog','information_schema')
order by 1,2,3

If you want an equivalent that uses pg_catalog (non-portable outside of
PostgreSQL) you could instead do:

select n.nspname as table_schema, c.relname as table_name,
a.attname as column_name
from pg_catalog.pg_attribute a
join pg_catalog.pg_class c on (a.attrelid = c.oid)
join pg_catalog.pg_namespace n on (c.relnamespace = n.oid)
where c.relkind in ('r','v') and a.attnum > 0
and n.nspname not in ('pg_catalog','information_schema')
order by 1,2,3

-Jon

--
Senior Systems Developer
Media Matters for America
http://mediamatters.org/

On Thu, Jun 07, 2007 at 06:36:07PM -0400, Jon Sime wrote:

select n.nspname as table_schema, c.relname as table_name,
a.attname as column_name
from pg_catalog.pg_attribute a
join pg_catalog.pg_class c on (a.attrelid = c.oid)
join pg_catalog.pg_namespace n on (c.relnamespace = n.oid)
where c.relkind in ('r','v') and a.attnum > 0
and n.nspname not in ('pg_catalog','information_schema')
order by 1,2,3

Don't forget "and not a.attisdropped" else you might get something
like

table_schema | table_name | column_name
--------------+------------+------------------------------
public | foo | ........pg.dropped.2........
public | foo | col1
public | foo | col3
(3 rows)

--
Michael Fuhr

On 07/06/07, Jon Sime <jsime@mediamatters.org> wrote:

Jonathan Vanasco wrote:

Does anyone have a trick to list all columns in a db ?

No trickery, just exploit the availability of the SQL standard
information_schema views:

select table_schema, table_name, column_name
from information_schema.columns
where table_schema not in ('pg_catalog','information_schema')
order by 1,2,3

Is there any easy way to remove the views from the query?

Peter.

If you want an equivalent that uses pg_catalog (non-portable outside of

In this query:

select n.nspname as table_schema, c.relname as table_name,
a.attname as column_name
from pg_catalog.pg_attribute a
join pg_catalog.pg_class c on ( a.attrelid = c.oid)
join pg_catalog.pg_namespace n on (c.relnamespace = n.oid)
where c.relkind in ('r','v') and a.attnum > 0
and n.nspname not in ('pg_catalog','information_schema')
order by 1,2,3

change the following:
where c.relkind in ('r','v')
to
where c.relkind = 'r'

Cheers,

Andy

Thank you Jon -- thats the exact sort of trick I was hoping for.

Cheers!

On Jun 7, 2007, at 6:36 PM, Jon Sime wrote:

Jonathan Vanasco wrote:

Does anyone have a trick to list all columns in a db ?

No trickery, just exploit the availability of the SQL standard
information_schema views:

select table_schema, table_name, column_name
from information_schema.columns
where table_schema not in ('pg_catalog','information_schema')
order by 1,2,3

If you want an equivalent that uses pg_catalog (non-portable
outside of PostgreSQL) you could instead do:

select n.nspname as table_schema, c.relname as table_name,
a.attname as column_name
from pg_catalog.pg_attribute a
join pg_catalog.pg_class c on (a.attrelid = c.oid)
join pg_catalog.pg_namespace n on (c.relnamespace = n.oid)
where c.relkind in ('r','v') and a.attnum > 0
and n.nspname not in ('pg_catalog','information_schema')
order by 1,2,3

-Jon

--
Senior Systems Developer
Media Matters for America
http://mediamatters.org/

// Jonathan Vanasco

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