From: | AlexK <alkuzo(at)gmail(dot)com> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: How to unnest an array with element indexes |
Date: | 2014-02-19 19:57:48 |
Message-ID: | 1392839868185-5792774.post@n5.nabble.com |
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Thread: | |
Lists: | pgsql-sql |
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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