使用 json 的 postgres 查询

Question

I have JSON in a column named payload :

"status":"E",
"statusText":"{\"status\":\"INVALID\",\"description\":\"Данные некорректны\}",
"errorCode":"smev_error"

I know how to get only statusText :

SELECT payload::json->>'statusText' FROM table_name;

It will show me

-[ RECORD 1 ]----------------------------------------------------
?column? | {"status":"INVALID","description":"Данные некорректны"}

I need to get only description . I found out construction with #> can resolve my trouble but I don't really know how to build a query with that. So I want to get something like that:

?column? | {"Данные некорректны"}

Could you help me please?

Answer 1

Just cast once again to have the status text as json as well.

SELECT (payload::json->>'statusText')::json->>'description' AS description
       FROM table_name;