Re: How to select values in a JSON type of column?

Snjezana Frketic schrieb am 18.11.2020 um 17:00:
> I actually have version 9.3.17 😬
>
>
> On Wed, 18 Nov 2020 at 15:55, Thomas Kellerer <shammat(at)gmx(dot)net <mailto:shammat(at)gmx(dot)net>> wrote:
>
> Snjezana Frketic schrieb am 18.11.2020 um 11:29:
> > I have a column called |targeting| in a table called |campaigns| .
> > [...]
> > and I need to select all the |ids| in |includes|.
> > Currently, I am doing it like this
> >
> > SELECT |targeting#>'{targets,0,audienceSegments,0,includes,0,segments,allOf,0,ids}'FROM campaigns;|
> >
>
> If you are on Postgres 12 or later, this can be done using jsonb_path_query_array:
>
>   select jsonb_path_query_array(targeting, '$.targets[*].*.includes.**.ids.id <http://ids.id>')
>   from campaigns

If you are limited to an unsupported version, you need to go down the hierarchy manually:

select t.ids
from campaigns c
cross join lateral (
select array_agg(s2.seg2 ->> 'id') as ids
from json_array_elements(c.targeting -> 'targets') as t(target)
cross join json_array_elements(t.target -> 'audienceSegments') as a(aud)
cross join json_array_elements(a.aud -> 'includes') as i(include)
cross join json_array_elements(i.include #> '{segments,allOf}') as s(seg)
cross join json_array_elements(s.seg -> 'ids') as s2(seg2)
) t