Tough Sql Server Join Query - sql-server

Question

I am building an application for my semestre exam which will take place in 20 days. My app should assist teachers to build more easily our faculty timetable.
I am working with a database approach (Sql Server 2008 and Delphi XE2). I have a few tables that describe the student formations structure. So I have Years, Series, Specializations, Groups and SemiGroups. Like in the image Years contains Series, Series contain Specializations, Specializations contains Groups and Groups may contain or not SemiGroups. I have also tables with Courses, Teachers, ClassRooms, Days and HourlyIntervals.
There are a few conditions:
A teacher may take a course with one or more Specializations, OR with one or more Groups, OR with one or more Semigroups.
The second condition is that Courses are of 3 types: TeachingCourse, Seminary, Laboratory (only two from three possible for each CourseName).(stored in the column Scheduler.CourseType char(3) )
The third one: Courses can be kept in all weeks of a semester, or in oddweek numbers,or in weeks number dividable by 2.(stored in the column Scheduler.Week char(3))
So I am storing the correlations in a SchedulerTable.
So if a Group has a course with a certain teacher I will introduce only the corresponding IDs.
I built almost all the data introducing forms and now I am at the Reporting part of the application. I am using Report Services from MSSQL 2008.
I want to list a scheduler that will include all the correlations for a certain Specialization (that one includes Groups and/or Semigroups). I have managed to show all correlations for Groups belonging to that certain Specializations but I can't manage to show alse the Specialization and Semigroups courses.
This is the query that returns me Groups correlations from a certain Specialization.
SELECT Days.DayName, HourlyIntervals.HourlyIntervalName, Scheduler.Week, Scheduler.CourseType, Courses.CourseName, ClassRooms.ClassRoomName, Teachers.TeacherName,Specializations.SpecName, Groups.GroupsName
FROM Scheduler INNER JOIN
Groups ON Scheduler.GroupID = Groups.GroupID INNER JOIN
Days ON Scheduler.DayID = Days.DayID INNER JOIN
HourlyIntervals ON Scheduler.HourlyIntervalID = HourlyIntervals.HourlyIntervalID INNER JOIN
Teachers ON Scheduler.TeacherID = Teachers.TeacherID INNER JOIN
Courses ON Scheduler.CourseID = Courses.CourseID INNER JOIN
ClassRooms ON Scheduler.ClassRoomID = ClassRooms.ClassRoomID INNER JOIN
Specializations ON Groups.IDSpec = Specializations.IDSpec
WHERE (Specializations.ID = #SpecID)
ORDER BY Days.DayID, HourlyIntervals.HourlyIntervalID
But I want it to return corelations for SemiGroups,Groups and Specialization for that certain Specialization. I tried to add a join with this one Scheduler.SemiGroupID=Semigroups.SemigroupID but the query returns 0 results then. I don't know if it can be done what I want but I will be thankful to anyone that points me an idea. Or should I use another structure for my correlations table (SchedulerTable).
This is a sample report (a PDF file) which I would like to get:
Edit Reason: Better explaining of the issue

Answer 1

So why isn't this the solution?
SELECT Days.DayName, HourlyIntervals.HourlyIntervalName, Scheduler.Week, Scheduler.CourseType, Courses.CourseName, ClassRooms.ClassRoomName, Teachers.TeacherName,Specializations.SpecName, SemiGroups.GroupsName
FROM Scheduler
INNER JOIN SemiGroups On Scheduler.SemiGroupId = SemiGroups.SemiGroupId
INNER JOIN Groups ON SemiGroups.GroupID = SemiGroups.Groups
INNER JOIN Days ON Scheduler.DayID = Days.DayID
INNER JOIN HourlyIntervals ON Scheduler.HourlyIntervalID = HourlyIntervals.HourlyIntervalID
INNER JOIN Teachers ON Scheduler.TeacherID = Teachers.TeacherID
INNER JOIN Courses ON Scheduler.CourseID = Courses.CourseID
INNER JOIN ClassRooms ON Scheduler.ClassRoomID = ClassRooms.ClassRoomID
INNER JOIN Specializations ON Groups.IDSpec = Specializations.IDSpec
WHERE (Specializations.ID = #SpecID)
ORDER BY Days.DayID, HourlyIntervals.HourlyIntervalID
Though I'll admit to a furrowed brow about whether GroupID in Schedules was the GroupID of the SemiGroupID in that row. Looks likes that bit isn't normalised.