On Tue, 2003-05-13 at 08:01, Dani Oderbolz wrote:
> Thats where the OUTER JOIN comes in - but this is - as far as i know-
> not directly supported in Postgres.
> You have to do this:
>
> Select product.name, color.name
> from
> product,
> color
> where product.color_id = color.color_id
> UNION
> Select product.name, 'No color'
> from
> product
> where
> color_id IS NULL;
This advice is out of date. PostgreSQL does indeed support outer joins
(since 7.1, I think).
SELECT product.name, COALESCE(color.name,'No color') FROM product LEFT
OUTER JOIN color ON product.color_id = color.color_id;
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
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