Date: Wed, 19 Feb 2014 11:57:48 -0800 (PST)
From: AlexK <alkuzo@gmail.com>
To: pgsql-sql@postgresql.org
Message-ID: <1392839868185-5792774.post@n5.nabble.com>
In-Reply-To: <1392838343105-5792771.post@n5.nabble.com>
References: <1392837956043-5792770.post@n5.nabble.com>
 <1392838343105-5792771.post@n5.nabble.com>
Subject: Re: How to unnest an array with element indexes
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David,

The array stores a time series of values for consecutive days. All I need is
take an array such as ARRAY[1.1,1.2] and return to the client the following

series_start_date + (array_index-1), array_value

Based on what you are saying, the following should do it:

with pivoted_array AS(
select unnest(ARRAY[1.1,1.2])
),
indexed_array AS(
select 
        row_number()OVER() AS element_index, 
        unnest as element_value
from pivoted_array)
SELECT 
        (DATE '2014-02-19' + INTERVAL '1d'*(element_index-1)) AS
series_date, 
        element_value AS series_value
FROM indexed_array

Can you confirm that this behavior is guaranteed and documented. I could not
find it in the docs.


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