SELECT and COUNT in one query from two tables with mySQL - mysql

Question

Here my tables structure:
___Rooms
|--------|-------------|------------|
| ROO_Id | ROO_HotelId | ROO_Status |
|--------|-------------|------------|
| 1 | 1 | active |
| 2 | 1 | active |
| 3 | 1 | inactive |
|--------|-------------|------------|
___Subscriptions
|-------------|-----------|
| SUB_HotelId | SUB_Limit |
|-------------|-----------|
| 1 | 24 |
|-------------|-----------|
I want to select SUB_Limit and count the number of rooms (only the active one).
So the query should returns me something like this:
|-----------|------------|
| SUB_Limit | ROO_Number |
|-----------|------------|
| 24 | 2 |
|-----------|------------|
Why this query do not return me the desired output please ?
SELECT
SUB_Limit,
COUNT(ROO_Id) AS ROO_Number
FROM ___Rooms
LEFT JOIN ___Subscriptions
ON ___Rooms.ROO_HotelId = ___Subscriptions.SUB_HotelId
WHERE ROO_Status = 'active'
AND SUB_HotelId = 1
AND ROO_HotelId = 1
Actually, it gave me:
|-----------|------------|
| SUB_Limit | ROO_Number |
|-----------|------------|
| NULL | 0 |
|-----------|------------|

Answer 1

Try this below query once
SELECT
SUB_Limit, COUNT(ROO_Id) AS ROO_Number FROM
___rooms r,___subscriptions s
WHERE r.ROO_HotelId=s.SUB_HotelId AND ROO_Status='active'

Answer 2

Try below query:
SELECT s.sub_limit, count(ROO_Id)
FROM ___Rooms r
INNER JOIN ___Subscription s ON (s.SUB_HotelId = r.ROO_HotelId)
WHERE s.SUB_HotelId = 1
and r.ROO_STATUS = 'active'

Answer 3

You forgot GROUP BY
SELECT
S.SUB_Limit,
COUNT(*) AS ROO_Number
FROM ___Rooms AS R
RIGHT JOIN ___Subscriptions AS S
ON R.ROO_HotelId = S.SUB_HotelId
WHERE R.ROO_Status = 'active'
AND S.SUB_HotelId = 1
GROUP BY ROO_HotelId
UPD: group by is not necessary as we need only the number of all lines. Also RIGHT JOIN could not be available for your particular MySQL engine (unlike LEFT JOIN or INNER JOIN), so you would better use UNION constructions, to catch zero intersections with main table if I'm not mistaken.