Date: Wed, 19 Feb 2014 11:25:56 -0800 (PST)
From: AlexK <alkuzo@gmail.com>
To: pgsql-sql@postgresql.org
Message-ID: <1392837956043-5792770.post@n5.nabble.com>
Subject: How to unnest an array with element indexes
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Given an array such as ARRAY[1.1,1.2], I need to select both values and
indexes, as follows:

1;1.1
2;1.2

The following query does what I want for a simple example:

with pivoted_array AS(
select unnest(ARRAY[1.1,1.2])
)
select ROW_NUMBER() OVER() AS element_index, unnest as element_value
from pivoted_array

Is ROW_NUMBER() OVER() guaranteed to always return array's index? If not,
how should I predictably/deterministically do it?


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