How to get array/object number value in postgreSQL? - json

Question

Is it possible to get array/object number values.
I have a table called tableA:
create table "tableA" (
"_id" serial,
"userId" integer,
"dependentData" jsonb);
INSERT INTO "tableA"
("_id", "userId", "dependentData")
VALUES('55555', '1191', '[{"_id": 133, "type": "radio", "title": "questionTest7", "question": "questionTest7", "response": {"value": ["option_11"]}, "dependentQuestionResponse": [{"_id": 278, "type": "text", "title": "questionTest8", "question": "questionTest8", "response": {"value": ["street no 140"]}, "dependentQuestionResponse": []}]}, {"_id": 154, "type": "dropdown", "title": "questionTest8", "question": "questionTest8", "response": {"value": ["option_14"]}, "dependentQuestionResponse": []}]');
Array number is to be fetched. Output should be require below.
_id
userId
array/object
55555
1191
[0,0,1]

Answer 1

You can try something like this
select id, user_id,
(
with
base as (
select o1, oo1.a oo1 from (
select jsonb_array_elements(t.a) o1
from (select depend_data as a) t
) o
left join lateral (select a from jsonb_array_elements(o.o1-> 'dependentQuestionResponse') a) oo1 on true
)
select json_agg(nn) from (
select dense_rank() over(order by b.o1) - 1 nn, b.o1 from base b
union all
select dense_rank() over(order by b.o1) - 1 nn, b.oo1 from base b where oo1 is not null
order by nn
) tz
) as array_object
from
(select 55555 as id,
1191 as user_id,
'[{"_id": 133, "type": "radio", "title": "questionTest7", "question": "questionTest7", "response": {"value": ["option_11"]}, "dependentQuestionResponse": [
{"_id": 278, "type": "text", "title": "questionTest8", "question": "questionTest8", "response": {"value": ["street no 140"]},"dependentQuestionResponse": []}]},
{"_id": 154, "type": "dropdown", "title": "questionTest8", "question": "questionTest8", "response": {"value": ["option_14"]}, "dependentQuestionResponse": []}]'::jsonb as depend_data) t