Question

I have two associated tables (simplified schema)

mysql> describe booking;
+----------------+------------+
| Field          | Type       |
+----------------+------------+
| id             | int(11)    |
| room_id        | int(11)    |
| date_from      | date       |
| date_to        | date       |
+----------------+------------+   

mysql> describe room;       
+-------------+------------+
| Field       | Type       |
+-------------+------------+
| id          | int(11)    |
| isDouble    | tinyint(1) |
+-------------+------------+

What I need to do is get all the double (isDouble = true) rooms which are not booked during specified period (date_from, date_to) of time. I would like to get the result in one query.

Thanks for help.

Answer 1

try:

Select Distinct id RoomId
From room r
Where isDouble = 1
 And Not Exists
   (Select * From booking
    Where room_id = r.id
      And date_from <= @EndDateRange
      And date_to >= @StartDateRange)