Re: Getting json-value as varchar

Hi,

Am 06.01.22 um 13:36 schrieb Andreas Joseph Krogh:
> På torsdag 06. januar 2022 kl. 13:31:19, skrev Thomas Markus
> <t(dot)markus(at)proventis(dot)net>:
>
> Hi,
> Am 06.01.22 um 13:28 schrieb Andreas Joseph Krogh:
>> Hi, in PG-14 this query returns "value" (with double-quotes):
>> SELECT ('{"key":"value"}'::jsonb)['key'];
>> ┌─────────┐
>> │  jsonb  │
>> ├─────────┤
>> │ "value" │
>> └─────────┘
>> (1 row)
>>
>> and this returns 'value' (without the quotes):
>> SELECT ('{"key":"value"}'::jsonb)->> 'key';
>> ┌──────────┐
>> │ ?column? │
>> ├──────────┤
>> │ value    │
>> └──────────┘
>> (1 row)
>>
>> How to I use the subscript syntax and get the result as varchar
>> instead of JSONB, assuming I /know/ the JSON-field is a String?
> simply cast your value
> SELECT (('{"key":"value"}'::jsonb)->> 'key')::text;
>
> best regards
> Thoma
>
> I think you misread my message. What I want is for the subscript-version:
>> ('{"key":"value"}'::jsonb)['key']
> to return:
> ┌──────────┐
> │ ?column? │
> ├──────────┤
> │ value    │
> └──────────┘
>
> instead of
> ┌─────────┐
> │  jsonb  │
> ├─────────┤
> │ "value" │
> └─────────┘
yeah right :(

complicated but this should do:
SELECT  jsonb_build_array( ('{"key":"value"}'::jsonb)['key'] ) ->> 0;

> --
> *Andreas Joseph Krogh*
> CTO / Partner - Visena AS
> Mobile: +47 909 56 963
> andreas(at)visena(dot)com
> www.visena.com <https://www.visena.com>
> <https://www.visena.com>