Fetch records where json contains a particular object - postgresql

Question

I have a postgres 9.6 table which has a json field config. I want to fetch records from this table where the json has a particular key value pair.
My table is as follows
CREATE TABLE features(
id integer NOT NULL,
plan character,
config json NOT NULL
)
In the json field, I am storing a json in the form
[
{ "name": "A", "state": "active"},
{ "name": "B", "state": "inactive"},
{ "name": "C", "state": "active"}
]
Now, I am querying the database to fetch all the records for which the json field contains the key-value pair { "name": "B", "state": "inactive"}.
My query is as follows
select * from features where config #> '[{ "name": "B", "state": "inactive"}]';
However, I get an error
ERROR: operator does not exist: config #> unknown
Any idea where I am going wrong here. Pointers will be highly appreciated. TIA !!!

Answer 1

Operator #> is only available for jsonb data type:
CREATE TABLE features(
id integer NOT NULL,
plan character,
config jsonb NOT NULL
);
CREATE
insert into features values(1,'a',' [ { "name": "A", "state": "active"}, { "name": "B", "state": "inactive"}, { "name": "C", "state": "active"} ]');
INSERT 0 1
select * from features where config #> '[{ "name": "B", "state": "inactive"}]';
id | plan | config
----+------+----------------------------------------------------------------------------------------------------------
1 | a | [{"name": "A", "state": "active"}, {"name": "B", "state": "inactive"}, {"name": "C", "state": "active"}]
(1 row)
With json data type in the table, you can use:
select * from
(select json_array_elements(config)::jsonb as item from features) as setofjsonb
where item = '{"name": "B", "state": "inactive"}'::jsonb;
item
------------------------------------
{"name": "B", "state": "inactive"}
(1 row)