Saving a query in a table - postgresql

Question

I would like to store a table variable as to be accessed by another query within a function. Here is what I have so far.
CREATE OR REPLACE FUNCTION suggest(p_id INTEGER)
RETURNS TABLE (
r_id INT,
i_id INT
) AS $$
DECLARE
p_record INT[];
BEGIN
SELECT ingredient_id INTO p_record FROM shop_ingredients
WHERE item_id IN
(SELECT item_id FROM basket
WHERE user_id = p_id);
...
I am not sure whether the type of p-record should be an array of INTEGER or a RECORD. Within the function I would like to access such list of values, for example:
HAVING SUM(ingredient_id = ANY(p_record)) >= (COUNT(*)*0.6)
How can I achieve this? I have searched endlessly to understand how to manage this but to no avail.
The problem with creating a table, like so:
CREATE TEMP TABLE IF NOT EXISTS p_record
AS SELECT ingredient_id
FROM shop_ingredients
WHERE item_id IN
(SELECT item_id FROM basket
WHERE user_id = p_id);
is that if p_id parameter changes, the p_record variables does not.

Answer 1

Maybe the following SQL function can help:
create or replace function suggest(p_id int)
returns table (i_id int)
language sql
as
$$
select ingredient_id
from shop_ingredient
where item_id in
(select item_id from basket
where user_id = p_id);
$$;
Note that the SELECT statement column list must exactly match the TABLE clause after RETURNS keyword and this function is only SQL so no need of BEGIN/END block or intermediate record variable.