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help / color / mirror / Atom feedFrom: Rob Sargent <[email protected]>
To: Torsten Grust <[email protected]>
To: pgsql-sql <[email protected]>
Subject: Re: access sub elements using any()
Date: Mon, 31 Oct 2022 16:40:20 -0600
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
<[email protected]>
On 10/31/22 16:36, Torsten Grust wrote:
> Hi,
>
> On Mon, Oct 31, 2022, at 18:04, Rob Sargent wrote:
>> Given an array of arrays ( e.g. v = {{1,'a'},{2,'b'},{3,'c'},{2,'d'}}
>> ) is it possible, in plain sql, to access the first element of the
>> listed arrays using the IN function? Say I wanted just those with 2
>> as first element. "where 2 = any(v[1])" does not work and not sure
>> it's supported. And I cannot craft a lhs to fussy-match each of the
>> elements in v. Can this be done?
>
> if your inner arrays would be row values instead, i.e. if v would read
>
> v = array[(1,'a'),(2,'b'),(3,'c'),(2,'d')] :: t[]
> assuming CREATE TYPE t AS (x int, y text);
>
> then your query could simply be
>
> SELECT r.*
> FROM unnest(v) AS r
> WHERE r.x = 2;
>
> Cheers,
> —Torsten
>
> --
> | Torsten Grust
> | [email protected] <mailto:[email protected]>
>
>
Thank you!
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