postgres insert data from an other table inside array type columns - sql

Question

I have tow table on Postgres 11 like so, with some ARRAY types columns.
CREATE TABLE test (
id INT UNIQUE,
category TEXT NOT NULL,
quantitie NUMERIC,
quantities INT[],
dates INT[]
);
INSERT INTO test (id, category, quantitie, quantities, dates) VALUES (1, 'cat1', 33, ARRAY[66], ARRAY[123678]);
INSERT INTO test (id, category, quantitie, quantities, dates) VALUES (2, 'cat2', 99, ARRAY[22], ARRAY[879889]);
CREATE TABLE test2 (
idweb INT UNIQUE,
quantities INT[],
dates INT[]
);
INSERT INTO test2 (idweb, quantities, dates) VALUES (1, ARRAY[34], ARRAY[8776]);
INSERT INTO test2 (idweb, quantities, dates) VALUES (3, ARRAY[67], ARRAY[5443]);
I'm trying to update data from table test2 to table test only on rows with same id. inside ARRAY of table test and keeping originals values.
I use INSERT on conflict,
how to update only 2 columns quantities and dates.
running the sql under i've got also an error that i don't understand the origin.
Schema Error: error: column "quantitie" is of type numeric but expression is of type integer[]
INSERT INTO test (SELECT * FROM test2 WHERE idweb IN (SELECT id FROM test))
ON CONFLICT (id)
DO UPDATE
SET
quantities = array_cat(EXCLUDED.quantities, test.quantities),
dates = array_cat(EXCLUDED.dates, test.dates);
https://www.db-fiddle.com/f/rs8BpjDUCciyZVwu5efNJE/0
is there a better way to update table test from table test2, or where i'm missing the sql?
update to show result needed on table test:
**Schema (PostgreSQL v11)**
| id | quantitie | quantities | dates | category |
| --- | --------- | ---------- | ----------- | --------- |
| 2 | 99 | 22 | 879889 | cat2 |
| 1 | 33 | 34,66 | 8776,123678 | cat1 |

Answer 1

Basically, your query fails because the structures of the tables do not match - so you cannot insert into test select * from test2.
You could work around this by adding "fake" columns to the select list, like so:
insert into test
select idweb, 'foo', 0, quantities, dates from test2 where idweb in (select id from test)
on conflict (id)
do update set
quantities = array_cat(excluded.quantities, test.quantities),
dates = array_cat(excluded.dates, test.dates);
But this looks much more convoluted than needed. Essentially, you want an update statement, so I would just recommend:
update test
set
dates = test2.dates || test.dates,
quantities = test2.quantities || test.quantities
from test2
where test.id = test2.idweb
Note that this ues || concatenation operator instead of array_cat() - it is shorter to write.
Demo on DB Fiddle:
id | category | quantitie | quantities | dates
-: | :------- | --------: | :--------- | :------------
2 | cat2 | 99 | {22} | {879889}
1 | cat1 | 33 | {34,66} | {8776,123678}