Querying Problem

Mar 27, 2008

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

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Hi,

I'd like to get information about tables defined in the SqlCe20 database. So I tried to use the following which doesn't work:


string sql = "SELECT COLUMN_NAME AS CN FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = ?"cmd = new SqlCeCommand(sql, connection);cmd.Parameters.Add(newSqlCeDataParameter("A", DbTypes.NVarChar);cmd.Prepare();//later in codecmd.Parameters[0].Value = tableName;reader = cmd.ExecuteReader();while (reader.Read())....
Here the reader.Read() returns always false indepent of the table name.
In contrast doing the following without parameter works as expected:


reader = cmd.ExecuteReader(string.Format("SELECT COLUMN_NAME AS CN FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '{0}'", tableName));
while (reader.Read())

Because I have to execute this statemen often I have to use prepared statement with parameters.

How can I get it working?

Miroslaw

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Hey there!
I'm not sure how to explain this but here goes...
I'm a bit stuck, a new project that's come about "requires" me to query multiple databases as if they were tables.
1 Oracle database which stores information on our staff (this database is a part of some MIS software and can't be changed in any way)
1 SQL Server 2005 database which stores information on staff sickness
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Oracle DB
People


Person_Code
Forename
Surname
SQL DB
Sickness


Person_Code
Daydate
Lets say the query I want to perform is to select all the records from sickness where person code is 22334 and also get their name from the other db, so the output may look like
22334 Dann Rees 01/01/2007
22334 Dann Rees 03/01/2007
22334 Dann Rees 10/02/2007
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Please remember this is just a very simple example and the "actual" queries will be far more complicated, for instance finding all the employees of a certain department who is male and was sick in January. All the data for that example is stored in people (oracle) except for the dates which is stores in sick (SQL 2005). Now these are easy enough if they were tables in 1 database....but their not, their tables in 2 databases, and theres nothing I can do to change that :(
All help appreciated as this is becoming very urgent.
Many thanks
Dann
(I couldnt post this in the General data access forum for some reason)

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table2
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