I have a users table with columns like id, name, email, etc. I want to retrieve information of some users in the following format in a single json object:
{
"userId_1" : {"name" : "A", "email": "A@gmail.com"},
"userId_2" : {"name" : "B", "email": "B@gmail.com"}
}
Wherein the users unique id is the key and a json containing his information is its corresponding value.
I am able to get this information in two separate rows using json_build_object but I would want it get it in a single row in the form of one single json object.
You can use json aggregation functions:
select jsonb_object_agg(id, to_jsonb(t) - 'id') res
from mytable t
jsonb_object_agg() aggregates key/value pairs into a single object. The key is the id of each row, and the values is a jsonb object made of all columns of the table except id.
Sample data:
id | name | email :------- | :--- | :---------- userid_1 | A | A@gmail.com userid_2 | B | B@gmail.com
Results:
| res |
| :----------------------------------------------------------------------------------------------------- |
| {"userid_1": {"name": "A", "email": "A@gmail.com"}, "userid_2": {"name": "B", "email": "B@gmail.com"}} |
try -
select row_to_json(col) from T
link below might help https://hashrocket.com/blog/posts/faster-json-generation-with-postgresql
Try this:
SELECT json_object(array_agg(id), array_agg(json::text)) FROM ( SELECT id, json_build_object('name', name, 'email', email) as json FROM users_table ) some_alias_name
If your id is not of text type then you have to cast it to text too.