Querying Problem

Hi. I'm new to SQL on a large scale and I'm having some issues with a DB I'm trying to make a query to. Below are the 4 tables and at the end the query I'm trying to get functioning correctly. Basically I'm trying to create a query of classes for a specific student based on ones that are not in the student's major. So for instance if the student had 2 classes, one part of a computer science major and one part of some other major and the student had computer science as his major it would query only the non computer science major. It worked fine until I added multiple majors into the query that is where I read about using TOP 1 to get it work. Yet it still doesn't. I tried using INNER JOIN, LEFT JOIN, and RIGHT JOIN to no avail.

I hope someone can help!


Code Snippet

USE [C:PROGRAM FILESMICROSOFT SQL SERVERMSSQL.1MSSQLDATACOLLEGE.MDF]
GO
/****** Object: Table [dbo].[Student_Classes] Script Date: 03/26/2008 18:34:06 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Student_Classes](
[StudClassID] [int] IDENTITY(0,1) NOT NULL,
[StudentID] [int] NULL,
[ClassID] [nchar](7) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[CreditID] [int] NULL,
[Days] [nchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Time] [nchar](30) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Notes] [nchar](255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Semester] [nchar](40) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Completed] [tinyint] NULL,
CONSTRAINT [PK_Student_Classes] PRIMARY KEY CLUSTERED
(
[StudClassID] ASC
)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
ALTER TABLE [dbo].[Student_Classes] WITH CHECK ADD CONSTRAINT [FK_Student_Classes_ClassID] FOREIGN KEY([ClassID])
REFERENCES [dbo].[Classes] ([ClassID])
GO
ALTER TABLE [dbo].[Student_Classes] CHECK CONSTRAINT [FK_Student_Classes_ClassID]
GO
ALTER TABLE [dbo].[Student_Classes] WITH CHECK ADD CONSTRAINT [FK_Student_Classes_CreditID] FOREIGN KEY([CreditID])
REFERENCES [dbo].[Credits] ([CreditID])
GO
ALTER TABLE [dbo].[Student_Classes] CHECK CONSTRAINT [FK_Student_Classes_CreditID]
GO
ALTER TABLE [dbo].[Student_Classes] WITH CHECK ADD CONSTRAINT [FK_Student_Classes_StudentsID] FOREIGN KEY([StudentID])
REFERENCES [dbo].[Students] ([StudentID])
GO
ALTER TABLE [dbo].[Student_Classes] CHECK CONSTRAINT [FK_Student_Classes_StudentsID]

USE [C:PROGRAM FILESMICROSOFT SQL SERVERMSSQL.1MSSQLDATACOLLEGE.MDF]
GO
/****** Object: Table [dbo].[Classes] Script Date: 03/26/2008 18:34:49 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Classes](
[ClassID] [nchar](7) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[LongName] [nchar](255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Description] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
CONSTRAINT [PK_Classes] PRIMARY KEY CLUSTERED
(
[ClassID] ASC
)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

USE [C:PROGRAM FILESMICROSOFT SQL SERVERMSSQL.1MSSQLDATACOLLEGE.MDF]
GO
/****** Object: Table [dbo].[MajorRequiredClasses] Script Date: 03/26/2008 18:35:21 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[MajorRequiredClasses](
[MajorClassID] [int] IDENTITY(0,1) NOT NULL,
[MajorDisciplineID] [int] NULL,
[ClassID] [nchar](7) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
CONSTRAINT [PK_MajorRequiredClasses] PRIMARY KEY CLUSTERED
(
[MajorClassID] ASC
)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
ALTER TABLE [dbo].[MajorRequiredClasses] WITH CHECK ADD CONSTRAINT [FK_MajorRequiredClasses_ClassID] FOREIGN KEY([ClassID])
REFERENCES [dbo].[Classes] ([ClassID])
GO
ALTER TABLE [dbo].[MajorRequiredClasses] CHECK CONSTRAINT [FK_MajorRequiredClasses_ClassID]
GO
ALTER TABLE [dbo].[MajorRequiredClasses] WITH CHECK ADD CONSTRAINT [FK_MajorRequiredClasses_MajorDisciplineID] FOREIGN KEY([MajorDisciplineID])
REFERENCES [dbo].[MajorDiscipline] ([MajorDisciplineID])
GO
ALTER TABLE [dbo].[MajorRequiredClasses] CHECK CONSTRAINT [FK_MajorRequiredClasses_MajorDisciplineID]

USE [C:PROGRAM FILESMICROSOFT SQL SERVERMSSQL.1MSSQLDATACOLLEGE.MDF]
GO
/****** Object: Table [dbo].[Student_Majors] Script Date: 03/26/2008 18:35:33 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Student_Majors](
[MajorDisciplineID] [int] NOT NULL,
[StudentID] [int] NOT NULL,
CONSTRAINT [PK_Student_Majors] PRIMARY KEY CLUSTERED
(
[MajorDisciplineID] ASC,
[StudentID] ASC
)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
ALTER TABLE [dbo].[Student_Majors] WITH CHECK ADD CONSTRAINT [FK_Student_Majors_MajorDisciplineID] FOREIGN KEY([MajorDisciplineID])
REFERENCES [dbo].[MajorDiscipline] ([MajorDisciplineID])
GO
ALTER TABLE [dbo].[Student_Majors] CHECK CONSTRAINT [FK_Student_Majors_MajorDisciplineID]
GO
ALTER TABLE [dbo].[Student_Majors] WITH CHECK ADD CONSTRAINT [FK_Student_Majors_StudentID] FOREIGN KEY([StudentID])
REFERENCES [dbo].[Students] ([StudentID])
GO
ALTER TABLE [dbo].[Student_Majors] CHECK CONSTRAINT [FK_Student_Majors_StudentID]

SELECT
Student_Classes.StudClassID
,Student_Classes.Completed
,RTRIM(Student_Classes.ClassID) AS 'Class ID'
,RTRIM(Classes.LongName) AS 'Name'
,Classes.Description
,RTRIM(Student_Classes.Days) AS 'Days'
,RTRIM(Student_Classes.Time) AS 'Time'
,RTRIM(Student_Classes.Notes) AS 'Notes'
,RTRIM(Student_Classes.Semester) AS 'Semester'
FROM Student_Classes
,Classes
WHERE Student_Classes.StudentID = '0'
AND
Classes.ClassID = Student_Classes.ClassID
AND
(SELECT TOP 1 MajorRequiredClasses.ClassID FROM MajorRequiredClasses WHERE MajorRequiredClasses.MajorDisciplineID != (SELECT TOP 1 Student_Majors.MajorDisciplineID FROM Student_Majors WHERE Student_Classes.StudentID = '0')) = Student_Classes.ClassID