json postgres code example

Example 1: json array to string in postgresql

SELECT string_agg(trim(tdata::text, '"'), ', ') from jsonb_array_elements(CAST('[1 , 2]' as jsonb)) tdata

Example 2: json array to string in postgresql

SELECT 
	ID
	,(
		SELECT string_agg(trim(JsonString::text, '"'), ', ')
		FROM jsonb_array_elements(JsonData->'Name') JsonString
	) AS StringArray
FROM   tbl_TestJsonArray;

Example 3: json with postgresql

SELECT info ->> 'customer' AS customer,
	info -> 'items' ->> 'product' AS product
FROM orders
WHERE CAST ( info -> 'items' ->> 'qty' AS INTEGER) = 2

Example 4: postgres json

UPDATE users SET data = jsonb_set(data, '{name}', '"John"');

Example 5: how to get json data in postgresql

-- Give me params.name (text) from the events table
select params->>'name' from events;

-- Find only events with a specific name
select * from events where params->>'name' = 'Click Button';

-- Give me the first index of a JSON array
select params->ids->0 from events;

-- Find users where preferences.beta is true (boolean)
-- This requires type casting preferences->'beta' from json to boolean
select preferences->'beta' from users where (preferences->>'beta')::boolean is true;

Example 6: postgres json

UPDATE users SET tags = tags || array['admin'];