Re: "Concatenate" two queries - how?

Use "union" ???

-----Original Message-----
From: pgsql-general-owner(at)postgresql(dot)org
[mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of Stefan
Schwarzer
Sent: Wednesday, October 24, 2007 9:09 AM
To: pgsql-general(at)postgresql(dot)org
Subject: [GENERAL] "Concatenate" two queries - how?

Hi there,

I have two queries, which I would like to bring together to form one
result.

The first query is a simple SELECT on a table of national statistics.

SELECT
COALESCE(c.name, ''''),
year_start AS year,
value
FROM
fish_catch AS d
LEFT JOIN
countries AS c ON c.id = id_country
WHERE
(year_start = 1995 OR year_start = 2000 ) AND
(name = 'Afghanistan' OR name = 'Albania' )

The second query is an aggregation-on-the-fly of these national
statistics to its regions. The result is for example not "Germany,
France, Algeria, ...", but "Europe, Africa, ..."

SELECT
COALESCE(r.name, ''''),
year_start AS year,
SUM(value) AS value
FROM
life_expect AS d
LEFT JOIN
countries_view AS c ON c.id = id_country
RIGHT JOIN
regions AS r ON r.id = c.reg_id
WHERE
(year_start = 1995 OR year_start = 2000 ) AND
(r.name = 'Europe')
GROUP BY
r.name, year_start

Now, I want to enable queries which display national as well as
regional values. I could probably work with independent queries, but
I think it would be "cleaner" and more efficient to get everything
into a single query.

Can someone give me a hint how this would work?

Thanks a lot!

Stef

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