Postgre JSON Functions



[Postgre json_typeof](https://texonom.com/postgre-jsontypeof-6c3195708ede4b46af4aeb490f6d033a)


[PostgreSQL json_object_keys](https://texonom.com/postgresql-jsonobjectkeys-5ef02c51917a4b54bfdce8de237c663a)


> [Postgresql JSON 데이터 타입 handling](https://sas-study.tistory.com/268)

