How to create a temp table in PostgreSQL? - sql

Question

I'm trying to use temp table to simplify my query. At the beginning I used WITH, which was not recognized if I'm not joining each table specifically. What's the best way to approach this query? what's wrong with this syntax?
For the account that purchased the most (in total over their lifetime as a customer) standard_qty paper, how many accounts still had more in total purchases?
create temp table t1 as (
SELECT
a.id as account_id,
SUM(o.standard_qty) as all_std_qty
FROM
accounts a
JOIN orders o ON (a.id = o.account_id)
GROUP BY
1
order by
2 desc
limit
1
)
create temp table t2 as (
SELECT
a.id as account_id,
SUM(o.total) as total_purchases
FROM
accounts a
JOIN orders o ON (a.id = o.account_id)
GROUP BY
1
)
create temp table t3 as (
SELECT
t1.account_id,
t2.total_purchases as total_pur FROM
t1
JOIN t2
ON (t1.account_id = t2.account_id)
)
SELECT
count(a.id) as count_ids
FROM
accounts a
JOIN orders o ON (a.id = o.account_id)
WHERE
o.total > t3.total_pur

Answer 1

I think you missed a join with table t3 and you used it on where clause thats the problem ,can you please try with below query
WITH t1 as (
SELECT
a.id as account_id,
SUM(o.standard_qty) as all_std_qty
FROM
accounts a
JOIN orders o ON (a.id = o.account_id)
GROUP BY
1
order by
2 desc
limit
1
), t2 as (
SELECT
a.id as account_id,
SUM(o.total) as total_purchases
FROM
accounts a
JOIN orders o ON (a.id = o.account_id)
GROUP BY
1
), t3 as (
SELECT
t1.account_id,
t2.total_purchases as total_pur FROM
t1
JOIN t2
ON (t1.account_id = t2.account_id)
)
SELECT
count(a.id) as count_ids
FROM
accounts a
JOIN orders o ON (a.id = o.account_id)
inner join t3 on a.id=t3.account_id
WHERE
o.total > t3.total_pur