Re: how to find index columns

On Dec 5, 2006, at 8:43 PM, Andrew - Supernews wrote:
> On 2006-12-06, Timasmith <timasmith(at)hotmail(dot)com> wrote:
>> While pg_catalog.pg_index has the create index script I otherwise
>> cant
>> find the index columns in the information_schema.
>
> That's because there are no index columns in the information_schema.

I'm just a lonely lurker here and I never saw Timasmith's original
post -- only your response. Despite this sounding more like a -
general topic, here's the view I use:

CREATE VIEW information_schema.indexes AS
SELECT n.nspname AS schema_name,
c.relname AS table_name,
i.relname AS index_name,
substring(pg_get_indexdef(i.oid) FROM 'USING \\\\w+?
\\\\((.+?)\\\\)') AS column_names,
x.indisunique AS is_unique,
x.indisprimary AS is_pkey
FROM pg_index x
JOIN pg_class c ON c.oid = x.indrelid
JOIN pg_class i ON i.oid = x.indexrelid
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind = 'r'::"char" AND i.relkind = 'i'::"char"
ORDER BY schema_name, table_name, is_pkey desc, is_unique
desc, index_name;

Sadly, I create it in the "information_schema". It probably doesn't
handle functional or partial indexes nicely and it is only known to
work with PG v8.1.x. Maybe this will inspire someone to expand upon it.

eric