Re: How to get index columns/dir/ord informations?

> A pseudo code demonstrate it:
>
> select * from pg_index_columns where index_name = 'x2'
>
> Ordinal ColName IsAsc
> 1 a False
> 2 b True
>
> Have PGSQL same information?
>
>
AFAIK, you can pull that information from 'indexdef' column of pg_indexes.

select * from pg_indexes where tablename='a';

Best Regards,
Raghavendra
EnterpriseDB Corporation

> Thanks:
> dd
>
>
>
>
> 2011.04.01. 18:01 keltezéssel, Raghavendra írta:
>
> Hi,
>
> Query to list the tables and its concerned indexes.
>
> SELECT indexrelid::regclass as index , relid::regclass as
> table FROM pg_stat_user_indexes JOIN pg_index USING
> (indexrelid) WHERE idx_scan < 100 AND indisunique IS FALSE;
>
> Query will list the contraints.
>
> SELECT relname FROM pg_class WHERE oid IN ( SELECT indexrelid FROM
> pg_index, pg_class WHERE pg_class.oid=pg_index.indrelid AND ( indisunique =
> 't' OR indisprimary = 't' ) );
>
> To get the column order number, use this query.
>
> SELECT a.attname,a.attnum FROM pg_class c, pg_attribute a, pg_type t
> WHERE c.relname = 'vacc' AND a.attnum > 0 AND a.attrelid = c.oid AND
> a.atttypid = t.oid;
>
> Note: This query for a particular Table 'VACC'
>
>
> Best Regards,
> Raghavendra
> EnterpriseDB Corporation
>
> On Fri, Apr 1, 2011 at 8:54 PM, Durumdara <durumdara(at)gmail(dot)com> wrote:
>
>> Hi!
>>
>> I want to migrate some database to PG.
>> I want to make intelligens migrator, that makes the list of the SQL-s what
>> need to do to get same table structure in PG as in the Source DB.
>>
>> All things I can get from the views about tables, except the indices.
>>
>> These indices are not containing the constraints - these elements I can
>> analyze.
>>
>> I found and SQL that get the index columns:
>>
>>
>> select
>> t.relname as table_name,
>> i.relname as index_name,
>> a.attname as column_name
>> from
>> pg_class t,
>> pg_class i,
>> pg_index ix,
>> pg_attribute a
>> where
>> t.oid = ix.indrelid
>> and i.oid = ix.indexrelid
>> and a.attrelid = t.oid
>> and a.attnum = ANY(ix.indkey)
>> and t.relkind = 'r'
>> and t.relname = 'a'
>> and ix.indisunique = 'f'
>> and ix.indisprimary = 'f'
>> order by
>> t.relname,
>> i.relname;
>>
>> This can list the columns. But - what a pity - this don't containing
>> that:
>> - Is this index unique?
>> - What the direction of the sort by columns
>> - What is the ordinal number of the column
>>
>> So everything what I need to analyze that the needed index is exists or
>> not.
>>
>>
>> Please help me: how can I get these informations?
>> I don't want to drop the tables everytime if possible.
>>
>> Thanks:
>> dd
>>
>
>
>