how use column from one subquery to anoter subquery - sql

Question

I have two subquery .i want put p.price from first subquery into secound subquery(place XXX) . but get error => ORA-00904: "P"."PRICE": invalid identifier
select
p.product_id,
p.price,
l.delegation,
l.state
from users
inner join (
select
start_date,
price,
product_id,
row_number() over (partition by serial order by start_date desc ) as rn
from prices
) p on users.serial = p.serial
inner join (
select
sso_id ,
delegation,
state,
updated_at,
row_number() over (partition by state order by updated_at asc) as tl
from payments
where state = 'green' or (state = 'yellow' and delegation > XXX)
) l on users.sso_id= l.sso_id
where
p.rn = 1
and l.tl = 1

Answer 1

Join on the PAYMENTS table and filter the rows to exclude the invalid state/delegation rows and then generate the ROW_NUMBER and filter to find the first row per partition:
Oracle Setup:
CREATE TABLE users ( serial, sso_id ) AS
SELECT 1, 1 FROM DUAL UNION ALL
SELECT 2, 2 FROM DUAL UNION ALL
SELECT 3, 3 FROM DUAL;
CREATE TABLE prices ( serial, start_date, price, product_id ) AS
SELECT 1, DATE '2019-01-01', 20, 1 FROM DUAL UNION ALL
SELECT 1, DATE '2019-02-01', 30, 2 FROM DUAL UNION ALL
SELECT 1, DATE '2019-03-01', 25, 3 FROM DUAL UNION ALL
SELECT 2, DATE '2019-01-01', 20, 1 FROM DUAL UNION ALL
SELECT 2, DATE '2019-02-01', 25, 2 FROM DUAL UNION ALL
SELECT 2, DATE '2019-03-01', 30, 3 FROM DUAL UNION ALL
SELECT 3, DATE '2019-01-01', 40, 3 FROM DUAL;
CREATE TABLE payments ( sso_id, delegation, state, updated_at ) AS
SELECT 1, 20, 'green', DATE '2019-01-01' FROM DUAL UNION ALL
SELECT 1, 30, 'green', DATE '2019-02-01' FROM DUAL UNION ALL
SELECT 1, 27, 'green', DATE '2019-03-01' FROM DUAL UNION ALL
SELECT 1, 22, 'green', DATE '2019-04-01' FROM DUAL UNION ALL
SELECT 1, 26, 'yellow', DATE '2019-05-01' FROM DUAL UNION ALL
SELECT 2, 31, 'yellow', DATE '2019-01-01' FROM DUAL UNION ALL
SELECT 2, 31, 'green', DATE '2019-02-01' FROM DUAL UNION ALL
SELECT 3, 30, 'green', DATE '2019-01-01' FROM DUAL UNION ALL
SELECT 3, 30, 'yellow', DATE '2019-01-01' FROM DUAL UNION ALL
SELECT 3, 50, 'yellow', DATE '2019-02-01' FROM DUAL;
Query:
SELECT product_id,
price,
delegation,
state
FROM (
select p.product_id,
p.price,
l.delegation,
l.state,
row_number() over ( partition by l.sso_id, l.state order by l.updated_at asc) as tl
from users
inner join (
select serial,
start_date,
price,
product_id,
row_number() over (partition by serial order by start_date desc ) as rn
from prices
) p
on ( users.serial = p.serial AND p.rn = 1 )
inner join payments l
on ( users.sso_id = l.sso_id AND ( l.state = 'green' or (l.state = 'yellow' and l.delegation > p.price ) ) )
)
where tl = 1
Output:
PRODUCT_ID | PRICE | DELEGATION | STATE
---------: | ----: | ---------: | :-----
3 | 25 | 20 | green
3 | 25 | 26 | yellow
3 | 30 | 31 | green
3 | 30 | 31 | yellow
3 | 40 | 30 | green
3 | 40 | 50 | yellow
db<>fiddle here

Answer 2

Use it in the main WHERE clause
select
p.product_id,
p.price,
l.delegation,
l.state
from users
inner join (
select
start_date,
price,
product_id,
row_number() over (partition by serial order by start_date desc ) as rn
from prices
) p on users.serial = p.serial
inner join (
select
sso_id ,
delegation,
state,
updated_at,
row_number() over (partition by state order by updated_at asc) as tl
from payments
where state = 'green' or state = 'yellow'
) l on users.sso_id= l.sso_id
where
p.rn = 1
and l.tl = 1
-- add following condition
and l.delegation > p.price

Answer 3

We need to rejoin your users and price table to your payment to get matching p.price
SELECT p.product_id,
p.price,
l.delegation,
l.state
FROM users
INNER JOIN
(SELECT start_date,
price,
product_id,
ROW_NUMBER() OVER (PARTITION BY serial ORDER BY start_date DESC) AS rn
FROM prices) p ON users.serial = p.serial
INNER JOIN
(SELECT y.sso_id,
y.delegation,
y.state,
y.updated_at,
ROW_NUMBER () OVER (PARTITION BY y.state ORDER BY y.updated_at ASC) AS tl
FROM payments y
INNER JOIN users u ON u.sso_id = y.sso_id
INNER JOIN prices p ON p.serial = y.serial
WHERE tl.state = 'green' OR (tl.state = 'yellow' AND tl.delegation > p.price)) l ON users.sso_id = l.sso_id
WHERE
AND p.rn = 1 AND l.tl = 1