从JSON数据类型Postgres的数组中获取一些元素

Question

I have a table "products" which have multi columns, on of these column "specifications" is json and I have this data on it:

[
        {
            "en":"Weight",
            "ar":"الوزن",
            "value":"100"
        },
        {
            "en":"Height",
            "ar":"الارتفاع",
            "value":"300"
        }
    ]

I need to get only "en, value" or "ar, value" from this field in addition to remain fields of the table.

Answer 1

Lets try this

select column_names,
 --all column names you can left "specifications" column
(select string_agg(v,',') from
(select '(' || (val->>'en')::text || ',' || (val->>'value')::text || ')' as v 
    --You can put whatever json key-value you want here 
 from (select value as val from
(select value from json_array_elements("specifications"))))) from "products"

hope it works for you.