SQL: Group By and create a new json column - sql

Question

I have a table
-----------------------------------------------------
| id | name | result |
-----------------------------------------------------
| 1 | Maria | {type: download, status: pass} |
| 1 | Maria | {type: login, status: fail} |
| 2 | Tony | {type: download, status: fail} |
| 3 | Kate | {type: download, status: pass} |
| 3 | Kate | {type: login, status: pass} |
| 3 | Kate | {type: logout, status: pass} |
| 4 | Tom | {type: download, status: pass} |
-----------------------------------------------------
And I want to try to get this but not sure that it possible:
-----------------------------------------------------------
| id | name | download | action |
-----------------------------------------------------------
| 1 | Maria | pass | {login: fail} |
| 2 | Tony | fail | |
| 3 | Kate | pass | {login: pass, logout: pass} |
| 4 | Tom | pass | |
-----------------------------------------------------------
I found way to create a new simple column:
SELECT id, name
results.download AS download
FROM
(
SELECT id, name jsonb_agg(result) AS results
FROM my_table
GROUP BY id, name
) AS r
ORDER BY id, name;
but also I want to move login and logout field to action column. Is it possible?

Answer 1

The formatting is not exactly as you want but we have the right information in the right place.
create table my_table (
id int,
name varchar(10),
result text
);
insert into my_table values
(1,'Maria','{ "type": "download", "status": "pass"}'),
(1,'Maria','{ "type": "login", "status": "fail"}'),
(2,'Tony','{ "type": "download", "status": "fail"}'),
(3,'Kate','{ "type": "download", "status": "pass"}'),
(3,'Kate','{ "type": "login", "status": "pass"}'),
(3,'Kate','{ "type": "logout", "status": "pass"}'),
(4,'Tom','{ "type": "download", "status": "pass"}');
✓
7 rows affected
SELECT id, name
results.download AS download
FROM
(
SELECT id, name jsonb_agg(result) AS results
FROM my_table
GROUP BY id, name
) AS r
ORDER BY id, name;
ERROR: syntax error at or near "."
LINE 2: results.download AS download
^
select
id,
name,
result::json->'type' AS type,
result::json->'status' AS status
FROM my_table
id | name | type | status
-: | :---- | :--------- | :-----
1 | Maria | "download" | "pass"
1 | Maria | "login" | "fail"
2 | Tony | "download" | "fail"
3 | Kate | "download" | "pass"
3 | Kate | "login" | "pass"
3 | Kate | "logout" | "pass"
4 | Tom | "download" | "pass"
with cte as
(select
id,
name,
case when cast(result::json->'type' as text) = '"download"'
then cast(result::json->'status' as text) end as "download" ,
case when cast(result::json->'type' as text) in ('"login"','"logout"')
then concat(result::json->'type',': ',result::json->'status') end as "action"
from my_table)
select
id,
name,
max(download),
string_agg(action,', ') "action"
from cte
group by
id,
name
order by id
id | name | max | action
-: | :---- | :----- | :--------------------------------
1 | Maria | "pass" | "login": "fail"
2 | Tony | "fail" | null
3 | Kate | "pass" | "login": "pass", "logout": "pass"
4 | Tom | "pass" | null
db<>fiddle here

Answer 2

You can aggregate the downloads and the "other" items into two separate columns:
with data as (
select id,
name,
jsonb_object_agg('download', result ->> 'status') filter (where result ->> 'type' = 'download') as download,
jsonb_object_agg(result ->> 'type', result ->> 'status') filter (where result ->> 'type' <> 'download') as result
from my_table
group by id, name
)
select id, name,
download ->> 'download' as download,
result
from data;
The CTE returns this:
id | name | download | results
---+-------+----------------------+------------------------------------
1 | Maria | {"download": "pass"} | {"login": "fail"}
2 | Tony | {"download": "fail"} |
3 | Kate | {"download": "pass"} | {"login": "pass", "logout": "pass"}
4 | Tom | {"download": "pass"} |
And the final then just extracts the value for the download key.
Online example