Re: find column names from query

----- Original Message -----
From: "Michael Fuhr" <mike@fuhr.org>
To: "Afton & Ray Still" <rastill@shaw.ca>
Cc: "PostgreSQL Novice" <pgsql-novice@postgresql.org>
Sent: Monday, January 24, 2005 1:42 AM
Subject: Re: [NOVICE] find column names from query


> On Sun, Jan 23, 2005 at 11:46:15PM -0700, Afton & Ray Still wrote:
>
>> going through the documentation I found the following:
>>
>> SELECT attname::regclass FROM pg_attribute WHERE attrelid =
>> travel::regclass
>
> Are you sure the example looked like that?

 The original example was:
SELECT attrelid::regclass, array_accum(attname)
    FROM pg_attribute
    WHERE attnum > 0 AND attrelid = 'pg_user'::regclass
    GROUP BY attrelid;but (copied from above) I cut it down toSELECT
attname::regclass FROM pg_attribute WHERE attrelid = travel::regclass (oops,
missed the ''. I also used a different table name.as found
at:http://www.postgresql.org/docs/8.0/interactive/xaggr.html



> attname is a name type
> and shouldn't be cast to regclass, and "travel" should be in single
> quotes if it's a table name.  Try this:
>
> SELECT attname FROM pg_attribute WHERE attrelid = 'travel'::regclass;
>
> Here's something a little more useful:
>
> SELECT attname
> FROM pg_attribute
> WHERE attrelid = 'travel'::regclass
>  AND attisdropped IS FALSE
>  AND attnum >= 1
> ORDER BY attnum;
>
> If you're using PostgreSQL 7.4 or later then you could also use the
> Information Schema; see the documentation for details.
>
> SELECT column_name
> FROM information_schema.columns
> WHERE table_name = 'travel'
> ORDER BY ordinal_position;
>
> --
> Michael Fuhr
> http://www.fuhr.org/~mfuhr/
>
>
> --
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>

Ray



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