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