COUNT and SELECT into the same query in mySQL - mysql

Question

Form my two tables, 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 | ROO_HotelId |
|-----------|------------|-------------|
| 10 | 0 | 1 |
| 15 | 3 | 2 |
| 5 | 2 | 3 |
| 25 | 0 | 4 |
|-----------|------------|-------------|
Why this query do not return me the desired output please ?
SELECT
ROO_HotelId,
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 |
|-----------|------------|
| 15 | 3 |
| 5 | 2 |
|-----------|------------|
So I haven't the ___Subscriptions with no rooms.
Here the SQL Fiddle for help.
Thanks in advance.

Answer 1

The query below gives you the result you want.
SELECT
SUB_HotelId,
SUB_Limit,
COUNT(ROO_Id) AS ROO_Number
FROM ___Subscriptions
LEFT JOIN ___Rooms ON
___Rooms.ROO_HotelId = ___Subscriptions.SUB_HotelId
WHERE ROO_Status = 'active' or ROO_Status is null
GROUP BY SUB_HotelId
You need to check for ROO_Status = 'active' or NULL because if the subscription is not linked to a room, there will be no value for ROO_Status. Also, you need to group on SUB_HotelId, because ROO_HotelId will also be null if there is no room to join the subscription to.
Link to fiddle: http://sqlfiddle.com/#!9/c6920c/35