Postgres select where in json array containing json

You need a unique column (usually a primary key, let's say id), so your data should look like this:

(1, '[{"name": "145119603", "numberOfCarrot": 2}]'),
(2, '[{"name": "1884595530", "numberOfCarrot": 1}]'),
...

Use jsonb_array_elements() in lateral join. Examples:

select max(value->>'numberOfCarrot')::int
from my_table,
jsonb_array_elements(jdata);

 max 
-----
  43
(1 row) 

select id, max((value->>'numberOfCarrot')::int)
from my_table,
jsonb_array_elements(jdata)
group by 1
order by 1;

 id | max 
----+-----
  1 |   2
  2 |   1
  3 |   1
  4 |   1
  5 |  43
  6 |   1
  7 |   1
  8 |   0
  9 |  23
 10 |  10
(10 rows)

How to use where:

select id, value->>'numberOfCarrot' as "numberOfCarrot"
from my_table,
jsonb_array_elements(jdata)
where (value->>'numberOfCarrot')::int > 20;

 id | numberOfCarrot 
----+----------------
  5 | 43
  9 | 23
(2 rows)

select id, array_agg(value->>'numberOfCarrot') as "numberOfCarrot"
from my_table,
jsonb_array_elements(jdata)
where (value->>'numberOfCarrot')::int > 2
group by 1
order by 1;

 id | numberOfCarrot 
----+----------------
  5 | {43}
  9 | {3,23}
 10 | {10}
(3 rows)