First query: All rooms of tour, even if unbooked

doc/booking_query_1_of_2.all_tour_rooms.sql

@@ -0,0 +1,23 @@
+-- tour_room based display ( Suppresses users without room)
+SELECT   
+    qry.tour_id,
+    qry.room_id,
+    b.user_id,
+    qry.capacity,
+    qry.room_name,
+    COALESCE(qry.room_name,'Ungebucht') room_name,
+    COALESCE(qry.room_name,'ZZZZZZZZZ') room_sort_order
+FROM (
+     SELECT
+         tr.tour_id,
+         tr.id as room_id,
+         tr.capacity,
+         tr.name as room_name
+     FROM
+         tour_rooms tr
+     WHERE 
+        tr.tour_id= 17
+     ) qry LEFT JOIN bookings as b
+           ON b.tour_id = qry.tour_id AND b.room_id=qry.room_id
+     ORDER BY 6,4
+;