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Postgres - select element from array


Postgres - select element from array

By : Andy Gersberg
Date : November 18 2020, 03:01 PM
this one helps. you have array of text arrays in facebook attribute, so to_json converts it to multidimensional array too, thus you need to operate arrays, eg:
code :
t=# with t(facebook) as (values('{{total_count,26861},{comment_count,94},{comment_plugin_count,0},{share_count,26631},{reaction_count,136}}'::text[]))
, arr as (select json_array_elements(to_json(facebook)) e from t)
select e->1 as total_count from arr where e->>0 = 'total_count';
 total_count
-------------
 "26861"
(1 row)


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Adding element to postgres array field fails while replacing the whole array works

Adding element to postgres array field fails while replacing the whole array works


By : phantomlord
Date : March 29 2020, 07:55 AM
wish of those help Active Record tracks which columns have changed and only saves these to the database. This change tracking works by hooking onto the setter methods - mutating an object inplace isn't detected. For example
code :
user.roles << "superuser"
user.roles += ["superuser"]
user.roles.gsub!(...)
user.roles_will_change!
Postgres 9.4 select by json array`s element value

Postgres 9.4 select by json array`s element value


By : orshee
Date : March 29 2020, 07:55 AM
this one helps. There is an 'accounts' table with 'data'::jsonb field filled with: , Your query expects the json value in the form:
code :
{
    "cars": {"body": "E-JZA80-ALFQZ", 
         "year": 1999, 
         "brand": "Toyota", 
         "model": "Vista Ardeo"} 
     , 
    "name": "Gilbert Moore", 
    "phone": "+13222314555"
}
select a.*
from accounts a
where data->'cars' @> '[{"brand":"Toyota"}]'
Postgres select by array element range

Postgres select by array element range


By : rodriguezz
Date : March 29 2020, 07:55 AM
hop of those help? There is no need to convert the array to text and use regexp. You can access a particular element of the array, e.g.:
code :
with pl(facebook) as (
values ('{{total_count,14},{comment_count,0},{comment_plugin_count,0},{share_count,12},{reaction_count,2}}'::text[])
)

select facebook[1][2] as total_count
from pl;

 total_count 
-------------
 14
(1 row) 
select *
from pl 
where facebook[1][2]::numeric between 5 and 10
with pl(id, facebook) as (
values 
    (1, '{{total_count,14},{comment_count,0}}'::text[]),
    (2, '{{total_count,null},{comment_count,null}}'::text[]),
    (3, '{{total_count,7},{comment_count,10}}'::text[])
)

select *
from pl 
where facebook[1][2]::numeric between 5 and 10

 id |               facebook               
----+--------------------------------------
  3 | {{total_count,7},{comment_count,10}}
(1 row) 
create table pl (
    ...
    facebook_total_count integer,
    facebook_comment_count integer, 
    ...
    );
with pl(id, facebook) as (
values 
    (1, '{"total_count": 14, "comment_count": 0}'::jsonb),
    (2, '{"total_count": null, "comment_count": null}'::jsonb),
    (3, '{"total_count": 7, "comment_count": 10}'::jsonb)
)

select *
from pl 
where (facebook->>'total_count')::integer between 5 and 10
Postgres jsonb_set - add array element at index larger than current array

Postgres jsonb_set - add array element at index larger than current array


By : BOB91
Date : March 29 2020, 07:55 AM
help you fix your problem The behavior is explained in the documentation (one of the notes at the end of the page):
code :
create or replace function jsonb_set_element(jsonb, int, jsonb)
returns jsonb language plpgsql as $$
begin
    while jsonb_array_length($1) < $2 loop
        $1 := $1 || '[null]'::jsonb;
    end loop;
    return jsonb_set($1, array[$2::text], $3, true);
end $$;
select 
    jsonb_set_element('[0,1,2]', 0, '9') as test_0,
    jsonb_set_element('[0,1,2]', 3, '3') as test_3,
    jsonb_set_element('[0,1,2]', 5, '5') as test_5

  test_0   |    test_3    |          test_5          
-----------+--------------+--------------------------
 [9, 1, 2] | [0, 1, 2, 3] | [0, 1, 2, null, null, 5]
(1 row)
Postgres SELECT * FROM Table where array has element

Postgres SELECT * FROM Table where array has element


By : Vittorio
Date : March 29 2020, 07:55 AM
wish help you to fix your issue
"Select * from contactTable where emails contains "email@two.com""
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