How to create temporary tables inside a postgres function - postgresql

Question

The problem here is that by the time i go to the UPDATE block of code, i no longer have access to the data that was in subquery
I tried many variations of creating a temporary table and a select into from deleted_rows instead of the subquery AS part of the WITH statement but it did not like anything i tried, and it especially didn't like me trying to create a table after the initial with clause
CREATE OR REPLACE FUNCTION public.aggregate_userviews(
)
RETURNS text
LANGUAGE 'plpgsql'
COST 100
VOLATILE
AS $BODY$BEGIN
WITH deleted_rows AS (
DELETE FROM user_details_views
WHERE ts < (timezone('UTC', now() - interval '5 minutes')) RETURNING *
), subquery AS (SELECT DISTINCT username, DATE(ts) as day_of_month, COUNT(id) AS user_views
FROM deleted_rows
GROUP BY username, day_of_month
ORDER BY day_of_month ASC)
INSERT INTO analytics_summary ( username, day_of_month, user_views)
SELECT username, day_of_month, user_views
FROM subquery
ON CONFLICT (username ,day_of_month)
DO UPDATE SET user_views = analytics_summary.user_views + excluded.user_views;
UPDATE user_details u
SET view_count = u.view_count + subquery.user_views
FROM subquery
WHERE u.username=subquery.username;
RETURN NULL;
END;$BODY$;
If i remove the update statement it works perfectly, and i could probably use a trigger to do the update but i would rather not if i am not far off from a solution with what i have

Answer 1

Got it, i had to create the table above the WITH and then fill it before the first insert and then use the temp table for the following two blocks of code like
CREATE OR REPLACE FUNCTION public.aggregate_userviews(
)
RETURNS text
LANGUAGE 'plpgsql'
COST 100
VOLATILE
AS $BODY$BEGIN
create temporary table temp_userviews_table (username varchar, day_of_month date, user_views int);
WITH deleted_rows AS (
DELETE FROM user_details_views
WHERE ts < (timezone('UTC', now() - interval '5 minutes')) RETURNING *
), subquery AS (SELECT DISTINCT username, DATE(ts) as day_of_month, COUNT(id) AS user_views
FROM deleted_rows
GROUP BY username, day_of_month
ORDER BY day_of_month ASC)
INSERT INTO temp_userviews_table (username, day_of_month, user_views)
SELECT username, day_of_month, user_views
FROM subquery;
INSERT INTO analytics_summary ( username, day_of_month, user_views)
SELECT username, day_of_month, user_views
FROM temp_userviews_table
ON CONFLICT (username ,day_of_month)
DO UPDATE SET user_views = analytics_summary.user_views + excluded.user_views;
UPDATE user_details u
SET view_count = u.view_count + temp_userviews_table.user_views
FROM temp_userviews_table
WHERE u.username=temp_userviews_table.username;
drop table temp_userviews_table;
RETURN NULL;
END;$BODY$;