Getting multiple results in a single query - mysql

Question

I need to know student - student ID, first name, last name. Those have not seen an event at a particular given Auditorium. I have to list these students in ascending last name order (through one query). Run the query twice, showing results for the Auditorium “London Theatre” in one run and “Brentwood Hall” in the second run.
I have no clue what this first and second run means. Also please check if the below will work for first run. I am thinking of creating a view and storing the first run, and writing the same query with "Brentwood Hall" and storing it in the second view. However, how will I display 2 views as part of same query then?
SELECT op.StudentID
, s.FirstName
, s.LastName
FROM auditorium a
JOIN audievent e
ON a.auditoriumID = e.AuditoriumID
JOIN reserver r
ON e.EventID = r.EventID
JOIN OrderProcessor op
ON r.OrderID = op.OrderID
JOIN Student s
ON op.StudentID = s.StudentID
WHERE op.StudentID NOT IN ( SELECT DISTINCT op.StudentID
FROM OrderProcessor op
LEFT
JOIN reserver r
ON op.OrderID = r.OrderID
LEFT
JOIN AudiEvent e
ON r.AuditoriumID = e.AuditoriumID
WHERE e.EventID NOT IN ( SELECT EventID FROM reserver)
)
AND a.AuditoriumName = 'London Theatre'
GROUP
BY op.StudentID;
OUTPUT:-
StudentID FirstName LastName
ID1 Andy Hall
ID2 Andy Halls
ID3 Mush Peters
ID4 Garry Hiegl
INPUT:-
Auditorium
AudiID AudiName
Audi01 London Theatre
Audi02 Brentwood Hall
Audi03 County Hall
AudiEvent
EventID AudiID
1 Audi01
2 Audi01
3 Audi01
4 Audi01
5 Audi01
6 Audi01
7 Audi01
8 Audi01
9 Audi01
10 Audi01
11 Audi02
12 Audi02
13 Audi02
14 Audi02
15 Audi02
16 Audi03
17 Audi03
18 Audi03
19 Audi03
20 Audi03
Reserver
ReserverID OrderID AudiID EventID
1 1 Audi01 1
2 1 Audi01 2
3 2 Audi01 3
4 2 Audi01 4
5 2 Audi02 14
6 3 Audi02 15
7 3 Audi02 11
8 4 Audi03 18
9 4 Audi03 19
10 4 Audi03 20
OrderProcessor
OrderID StudentID
1 ID01
2 ID02
3 ID03
4 ID04
Student
StudentID FirstName LastName
ID1 Andy Hall
ID2 Andy Halls
ID3 Mush Peters
ID4 Garry Hiegl

Answer 1

As #wildplasser mentioned, NOT EXISTS is perfect for this:
SELECT studentId, student.firstName, student.lastName
FROM Student
WHERE NOT EXISTS (SELECT 1
FROM OrderProcessor
JOIN Reserver
ON Reserver.orderId = OrderProcessor.orderId
JOIN AudiEvent
ON AudiEvent.eventId = Reserver.eventId
JOIN Auditorium
ON Auditorium.audiId = AudiEvent.audiId
AND Auditorium.audiName = 'London Theatre'
WHERE OrderProcessor.studentId = Student.studentId)
(working SQL Fiddle example)
The necessary changes to get students who haven't seen events at the 'Brentwood Hall' is left as an exercise to the reader.