From: Seb <spluque@gmail.com>
To: pgsql-sql@postgresql.org
Subject: complex column definition in query
Date: Tue, 02 Jun 2009 17:16:09 -0500
Message-ID: <87iqjep9hy.fsf@patagonia.sebmags.homelinux.org> (raw)
Hi,
Say we have a table:
SELECT * FROM weather;
city | temp_lo | temp_hi | prcp
---------------+---------+---------+-------
San Francisco | 46 | 50 | 0.25
San Francisco | 43 | 57 | 0
Hayward | 37 | 54 |
Hayward | 30 | 58 |
Somewhere | 25 | 60 |
Somewhere | 28 | 50 |
(6 rows)
I'm struggling to build a query with a column temp, where the first row
is the lowest temp_lo followed by all the temp_hi for each city. So
this would be the output:
city | temp
---------------+------
San Francisco | 43
San Francisco | 50
San Francisco | 57
Hayward | 30
Hayward | 54
Hayward | 58
Somewhere | 25
Somewhere | 60
Somewhere | 50
(6 rows)
Any ideas appreciated! Thanks.
Cheers,
--
Seb
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To: pgsql-sql@postgresql.org
Cc: spluque@gmail.com
Subject: Re: complex column definition in query
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