Re: INHERIT

Peter Harvey wrote:
>If I try to get the columns from pg_attribute using the oid of a child
>table created with INHERIT I get its columns AND all of its inherited
>columns.
>
>How do I just get the columns added by the child table?
>
>I figure I could check each column to see if they also exist in
>pg_attribute under a parent table but I figure there must be an
>easier/faster way? Another pg_* table perhaps? Besides; I am not certian
>this would work if there is a common column between a child and one of
>its parents (if that is even allowed)?
>
>As usual, any help would be greatly appreciated.

SELECT a.attname
FROM pg_attribute AS a,
pg_class AS c,
pg_inherits AS i
WHERE a.attrelid = c.oid AND
i.inhrelid = c.oid AND
c.relname = 'child_table'
AND a.attname NOT IN (
SELECT a.attname
FROM pg_attribute AS a,
pg_class AS c,
pg_inherits AS i
WHERE i.inhrelid = c.oid AND
a.attrelid = i.inhparent AND
c.relname = 'child_table'
)

--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
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