Re: Getting json-value as varchar

[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
    Thomas

 

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Andreas Joseph Krogh

CTO / Partner - Visena AS

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andreas@xxxxxxxxxx

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