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Re: Getting json-value as varchar

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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.markus@xxxxxxxxxxxxx>:
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@xxxxxxxxxx
www.visena.com
 


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