Postgres 9.4 jsonb menanyakan operator dasar

Anda perlu menggunakan ->> nilai hasil string:

WITH mytable(json_field) AS ( VALUES
  ('{"power": 200}'::JSONB),
  ('{"power": 400}'::JSONB),
  ('{"power": 0}'::JSONB),
  ('{"power": 146297}'::JSONB)
)
SELECT * FROM mytable where (json_field->>'power')::INTEGER < 2;

Hasilnya adalah:

  json_field  
--------------
 {"power": 0}
(1 row)