Unnest array / JSON in Bigquery - Get value from key - sql

Question

I have an array like this
[{"name": "Nome da Empresa", "value": "Land ", "updated_at": "2022-09-02T22:30:58Z"}, {"name": "Nome do Representante", "value": "Thomas GT", "updated_at": "2022-09-02T22:30:58Z"}, {"name": "Email Representante", "value": "p#xyz.com", "updated_at": "2022-09-02T22:30:58Z"}, {"name": "Qual o plano do cliente?", "value": "Go", "updated_at": "2022-09-02T22:31:12Z"},{"name": "Forma de pagamento", "value": "Internet Banking", "updated_at": "2022-09-16T14:09:53Z"}, {"name": "Valor total da guia", "value": "227,63", "updated_at": "2022-09-16T14:09:59Z"}]
I'm trying to get values from some "fields" like Nome da Empresa or Email Representante.
I've already tried use json_extract_scalar or unnest. With json_extract_scalar returns column with no values (blank) and with unnest returns error Values referenced in UNNEST must be arrays. UNNEST contains expression of type STRING
Query 1:
select
id,
fields,
json_extract_scalar(fields,'$.Email Representante') as categorias,
json_value(fields,'$.Nome da Empresa') as teste
from mytable
Query 2:
SELECT
id,
fields
from pipefy.cards_startup_pack, UNNEST(fields)
Any ideas? Thanks a lot!

Answer 1

You may try below query.
Query 1:
SELECT (SELECT JSON_VALUE(f, '$.value')
FROM UNNEST(JSON_QUERY_ARRAY(t.fields)) f
WHERE JSON_VALUE(f, '$.name') = 'Nome da Empresa'
) AS teste,
(SELECT JSON_VALUE(f, '$.value')
FROM UNNEST(JSON_QUERY_ARRAY(t.fields)) f
WHERE JSON_VALUE(f, '$.name') = 'Email Representante'
) AS categorias,
FROM mytable t;
# Query results
+-------+------------+
| teste | categorias |
+-------+------------+
| Land | p#xyz.com |
+-------+------------+
Query 2:
SELECT JSON_VALUE(f, '$.name') name, JSON_VALUE(f, '$.value') value
FROM mytable, UNNEST(JSON_QUERY_ARRAY(fields)) f;
# Query results
+--------------------------+------------------+
| name | value |
+--------------------------+------------------+
| Nome da Empresa | Land |
| Nome do Representante | Thomas GT |
| Email Representante | p#xyz.com |
| Qual o plano do cliente? | Go |
| Forma de pagamento | Internet Banking |
| Valor total da guia | "227,63" |
+--------------------------+------------------+