MySQL - Display all dates including zero data nested join - mysql

Question

I'm trying to display all dates in a month, and also in the reservation detail, I only have check_in_date and check_out_date, so I have to create left join inside a left join, below is my script
SELECT
*
FROM
(
SELECT
#dt:= DATE_ADD( #dt, interval 1 day ) myDate
FROM
(
SELECT
#dt := '2020-01-31'
) vars, tb_dummy
LIMIT 29
) JustDates
LEFT JOIN
(
SELECT
DATE_FORMAT(d.myDate2,'%Y-%m-%d') AS `myDate2`,
COALESCE(count(rdt.reservation_detail_id), 0) AS `RNS`,
FORMAT(SUM(rdt.subtotal_amount/COALESCE(DATEDIFF(DATE(DATE(rdt.check_out_date)), DATE(rdt.check_in_date)), 0)), 2) AS `REVENUE`,
FORMAT(SUM(rdt.subtotal_amount/COALESCE(DATEDIFF(DATE(DATE(rdt.check_out_date)), DATE(rdt.check_in_date)), 0))/COALESCE(count(rdt.reservation_detail_id), 0), 2) AS `AVGREV`
FROM
(
SELECT
#dt:= DATE_ADD( #dt, interval 1 day ) myDate2
FROM
(
SELECT
#dt := '2020-01-31'
) vars2, tb_dummy
LIMIT 29
) d
LEFT JOIN
tb_reservation_detail rdt
ON d.myDate2 BETWEEN DATE(rdt.check_in_date) AND DATE(DATE(rdt.check_out_date) - INTERVAL 1 DAY)
INNER JOIN
tb_reservation R
ON rdt.reservation_id = R.reservation_id
WHERE
rdt.reservation_status_id <> 3
AND
R.property_id = 57
GROUP BY d.myDate2
ORDER BY d.myDate2 ASC
) Resv
ON
JustDates.myDate = Resv.myDate2
ORDER BY
JustDates.myDate ASC
when i run it only return dates from the left table like : Left join result
but when I change
SELECT
*
FROM
(
SELECT
#dt:= DATE_ADD( #dt, interval 1 day ) myDate
FROM
(
SELECT
#dt := '2020-01-31'
) vars, tb_dummy
LIMIT 29
) JustDates
**LEFT JOIN**
(
to
SELECT
*
FROM
(
SELECT
#dt:= DATE_ADD( #dt, interval 1 day ) myDate
FROM
(
SELECT
#dt := '2020-01-31'
) vars, tb_dummy
LIMIT 29
) JustDates
**RIGHT JOIN**
(
it returns data from the right table like this: Right join result
What is wrong with my code?

Answer 1

welcome to StackOverflow. I think your problem is that you don't quite understand the difference between RIGHT JOIN and LEFT JOIN. Check out this StackOverflow post that goes over the differences.
As far as wanting to display all of the dates in a month, here's a link to an answer I posted that I believe does what you want it to. In my answer I provide an example query that contains a derived table you can select from and then LEFT JOIN your tables to so it will show all the days in the month regardless if there is data in your tables for a given day or not.
Hope this helps.