PostgreSQL Filter condition by subquery output - sql

Question

I have the query with subquery for result output as yesterday_sum column. I need to filter only rows where yesterday_sum > 1 but can't add HAVING sum(p.profit_percent) / :workDays > 1 AND yesterday_sum > 1 because yesterday_sum is not part of the GROUP BY. And I can't add a condition for positions p because yesterday_sum is not the positions column.
SELECT u.id AS id,
u.nickname AS title,
sum(p.profit_percent) / :workDays AS middle,
(
SELECT sum(ps.profit_percent)
FROM positions ps
WHERE ps.user_id = u.id
AND ps.open_at BETWEEN
:dateYesterday AND
:dateYesterday + INTERVAL '1 day'
GROUP BY (ps.user_id)
) AS yesterday_sum
FROM positions p
INNER JOIN users u ON u.id = p.user_id
AND p.profit_percent IS NOT NULL
AND p.parent_ticket IS NULL
AND p.close_at IS NOT NULL
AND p.open_at BETWEEN :dateFrom AND :dateTo
GROUP BY (u.id, u.nickname)
HAVING sum(p.profit_percent) / :workDays > 1
ORDER BY middle DESC;
How can I get rid of rows with yesterday_sum column less than 1 and NULL?

Answer 1

To use the column yesterday_sum in a WHERE clause you can produce the named column by placing the query as a subquery of the main one. Then, filtering is trivial.
For example, you can do:
select *
from (
SELECT u.id AS id,
u.nickname AS title,
sum(p.profit_percent) / :workDays AS middle,
(
SELECT sum(ps.profit_percent)
FROM positions ps
WHERE ps.user_id = u.id
AND ps.open_at BETWEEN
:dateYesterday AND
:dateYesterday + INTERVAL '1 day'
GROUP BY (ps.user_id)
) AS yesterday_sum
FROM positions p
INNER JOIN users u ON u.id = p.user_id
AND p.profit_percent IS NOT NULL
AND p.parent_ticket IS NULL
AND p.close_at IS NOT NULL
AND p.open_at BETWEEN :dateFrom AND :dateTo
GROUP BY (u.id, u.nickname)
HAVING sum(p.profit_percent) / :workDays > 1
) x
where yesterday_sum >= 1 -- yesterday_sum is available here
ORDER BY middle DESC;