Re: sql join question

Got it. Thanks!
Scott

On Mar 1, 2005, at 10:52 PM, Ragnar Hafstað wrote:

> On Tue, 2005-03-01 at 16:51 -0800, Scott Frankel wrote:
>> Sweet! And not so sweet.
>>
>> The natural join worked beautifully with my test schema; but it failed
>> to yield any rows with my real-world schema. I think I've tracked
>> down
>> why: duplicate column names. i.e.:
>> ...
>> CREATE TABLE palettes (palette_pkey SERIAL PRIMARY KEY,
>> palette_name text UNIQUE DEFAULT NULL,
>> qwe text);
>>
>> CREATE TABLE tones (tone_pkey SERIAL PRIMARY KEY,
>> tone_name text UNIQUE DEFAULT NULL,
>> palette_pkey integer REFERENCES palettes,
>> qwe text);
>>
>> Are the 'qwe' columns in both tables clobbering each other and
>> preventing the
>> join from succeeding?
>
> the docs really explain this better than I can, but a
> table1 NATURAL JOIN table2
> is shorthand fo a
> table1 JOIN table2 USING (list_of_common_keys)
>
> so:
> select color_name from palettes
> join tones USING (palette_pkey)
> join colors USING (tone_pkey)
> where palette_name='plt1';
>
> see:
> http://www.postgresql.org/docs/8.0/interactive/sql-select.html
>
> gnari
>
>
>