postgres：汇总许多表

Question

Need to select from projects and get something like:

[id] = int

[staff] = agg{users.data, staff.data, role.data}

[chief] = agg{users.data, staff.data, role.data}

[client] = agg{users.data, clients.data, role.data}

[involved] = [agg{users.data, staff.data, role.data}] , [agg{users.data, staff.data, role.data}], ...

[other_project_data]

I know about array_agg(json_agg) , but it require only 1 argument. And I get only [staff] = agg{user.data}

Answer 1

you need to use json_build_object/jsonb_build_object (key, value):

 jsonb_agg(
         jsonb_build_object(
                 'usersdata', users.data,
                 'staffdata', staff.data
          ))

UPD: answer to comment

Using two tables:

WITH users AS (
     SELECT 1 as id, 'aaa'::text AS data, 10 as cnt
), staff AS (
     SELECT 1 as user_id, 'bbbb'::text AS data, 5 as cnt
) 
SELECT
     jsonb_agg(
         jsonb_build_object(
                 'usersdata', u.data || s.data,
                 'usersdataarray', ARRAY[ u.data, s.data],
                 'cntdata', u.cnt + s.cnt
          ))
FROM users AS u
JOIN staff AS s ON (s.user_id = u.id)

WITH clause emulate your tables.