I have this sql
select post_id, tag
from finalcache
order by tag, post_rank desc
It gives this results.
How do i get the results to look like this?
{
"Politics": ["1e4fd2c5-c32e-4e3f-91b3-45478bcf0185"],
"Technology": [
"1e4fd2c5-c32e-4e3f-91b3-45478bcf0185",
"1e4fd2c5-c32e-4e3f-91b3-45478bcf0189",
"1e4fd2c5-c32e-4e3f-91b3-45478bcf0186",
]
}
I have been trying different combinations of json_build_object
and json_agg
like this
select json_build_object(tag, json_agg(post_id))
from finalcache
group by tag, post_rank
order by tag, post_rank desc
But I am just not getting the correct response. Any help will be very appreciated.
here is how you can do it:
select json_agg(jposts) from (
select json_build_object(tag , ARRAY_AGG(post_id)) jposts
from mytable
group by tag
) t
db<>fiddle here
first you prepare json for each row then use json_agg
to aggregate all json rows
try this:
WITH list AS
(
SELECT jsonb_agg(post_id) FILTER (WHERE tag = 'Politics') OVER () AS pol
, jsonb_agg(post_id) FILTER (WHERE tag = 'Technology') OVER () AS tech
FROM finalcache
ORDER BY post_rank desc
)
SELECT jsonb_build_object('Politics', l.pol, 'Technology', tech)
FROM list AS l
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