question

I am a new web developer and I am developing a simple training management system which provides the users with quizzes. The system developed using ASP.NET and SQLServer. I have the following database design: Employee Table: Username, Name, DivisionCode Divisions Table: SapCode, Divison Quiz Table: QuizID, Title, Description, IsSent UserQuiz: UserQuizID, QuizID, DateTimeComplete, Username (DivisionCode is a foreign key to the SapCode. IsSent is a flag to indicate to the quizzes that have been offered and sent to the users to participate in them.) I need to come up with a query that shows the percentage of participation of each division in all the offered safety quizzes (which means quizzes with IsSent = true). For example, If I have four divisions; A, B, C and D, and I have around 23 quizzes have been sent to the employees in those divisions. Since each division has a specific percentage of participation in each quiz. My query should show the overall percentage of participation in all offered quizzes for each division. So the result should not be broken down with respect to each quiz. So how to do that? And here's the schema of the database with its data: USE [Test] GO /****** Object: Table [dbo].[Divisions] Script Date: 08/03/2012 19:36:09 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO SET ANSI_PADDING ON GO CREATE TABLE [dbo].[Divisions]( [SapCode] [nvarchar](50) NOT NULL, [Division] [varchar](50) NOT NULL, CONSTRAINT [PK_Divisions] PRIMARY KEY CLUSTERED ( [SapCode] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO SET ANSI_PADDING OFF GO INSERT [dbo].[Divisions] ([SapCode], [Division]) VALUES (N'1', N'A') INSERT [dbo].[Divisions] ([SapCode], [Division]) VALUES (N'2', N'B') INSERT [dbo].[Divisions] ([SapCode], [Division]) VALUES (N'3', N'C') /****** Object: Table [dbo].[Quiz] Script Date: 08/03/2012 19:36:09 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO SET ANSI_PADDING ON GO CREATE TABLE [dbo].[Quiz]( [QuizID] [int] IDENTITY(1,1) NOT NULL, [Title] [varchar](50) NOT NULL, [Description] [varchar](50) NOT NULL, [IsSent] [bit] NOT NULL, CONSTRAINT [PK_Quiz] PRIMARY KEY CLUSTERED ( [QuizID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO SET ANSI_PADDING OFF GO SET IDENTITY_INSERT [dbo].[Quiz] ON INSERT [dbo].[Quiz] ([QuizID], [Title], [Description], [IsSent]) VALUES (1, N'Quiz I', N'Test', 1) INSERT [dbo].[Quiz] ([QuizID], [Title], [Description], [IsSent]) VALUES (2, N'Quiz II', N'Test test', 1) INSERT [dbo].[Quiz] ([QuizID], [Title], [Description], [IsSent]) VALUES (3, N'Quiz III', N'TEST TEST', 0) SET IDENTITY_INSERT [dbo].[Quiz] OFF /****** Object: Table [dbo].[Employee] Script Date: 08/03/2012 19:36:09 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO SET ANSI_PADDING ON GO CREATE TABLE [dbo].[Employee]( [Usename] [nvarchar](50) NOT NULL, [Name] [varchar](50) NOT NULL, [DivisionCode] [nvarchar](50) NOT NULL, CONSTRAINT [PK_Employee] PRIMARY KEY CLUSTERED ( [Usename] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO SET ANSI_PADDING OFF GO INSERT [dbo].[Employee] ([Usename], [Name], [DivisionCode]) VALUES (N'John12', N'John A', N'1') INSERT [dbo].[Employee] ([Usename], [Name], [DivisionCode]) VALUES (N'John13', N'John B', N'1') INSERT [dbo].[Employee] ([Usename], [Name], [DivisionCode]) VALUES (N'John15', N'John C', N'3') INSERT [dbo].[Employee] ([Usename], [Name], [DivisionCode]) VALUES (N'Maria12', N'Maria A', N'3') INSERT [dbo].[Employee] ([Usename], [Name], [DivisionCode]) VALUES (N'Rony14', N'Rony A', N'2') INSERT [dbo].[Employee] ([Usename], [Name], [DivisionCode]) VALUES (N'Tid52', N'Tid A', N'3') INSERT [dbo].[Employee] ([Usename], [Name], [DivisionCode]) VALUES (N'Tim12', N'Tim A', N'1') INSERT [dbo].[Employee] ([Usename], [Name], [DivisionCode]) VALUES (N'Tim15', N'Tim B', N'2') /****** Object: Table [dbo].[UserQuiz] Script Date: 08/03/2012 19:36:09 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[UserQuiz]( [UserQuizID] [int] IDENTITY(1,1) NOT NULL, [QuizID] [int] NOT NULL, [DateTimeComplete] [datetime] NOT NULL, [Score] [float] NOT NULL, [Username] [nvarchar](50) NOT NULL, CONSTRAINT [PK_UserQuiz] PRIMARY KEY CLUSTERED ( [UserQuizID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO SET IDENTITY_INSERT [dbo].[UserQuiz] ON INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (1, 1, CAST(0x0000A07900000000 AS DateTime), 100, N'John12') INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (2, 1, CAST(0x0000A07900000000 AS DateTime), 50, N'Tim12') INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (3, 1, CAST(0x0000A07B00000000 AS DateTime), 100, N'Rony14') INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (4, 1, CAST(0x0000A07900000000 AS DateTime), 0, N'Tim15') INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (5, 1, CAST(0x0000A07900000000 AS DateTime), 100, N'Tid52') SET IDENTITY_INSERT [dbo].[UserQuiz] OFF /****** Object: ForeignKey [FK_Employee_Divisions] Script Date: 08/03/2012 19:36:09 ******/ ALTER TABLE [dbo].[Employee] WITH CHECK ADD CONSTRAINT [FK_Employee_Divisions] FOREIGN KEY([DivisionCode]) REFERENCES [dbo].[Divisions] ([SapCode]) GO ALTER TABLE [dbo].[Employee] CHECK CONSTRAINT [FK_Employee_Divisions] GO /****** Object: ForeignKey [FK_UserQuiz_Employee] Script Date: 08/03/2012 19:36:09 ******/ ALTER TABLE [dbo].[UserQuiz] WITH CHECK ADD CONSTRAINT [FK_UserQuiz_Employee] FOREIGN KEY([Username]) REFERENCES [dbo].[Employee] ([Usename]) GO ALTER TABLE [dbo].[UserQuiz] CHECK CONSTRAINT [FK_UserQuiz_Employee] GO /****** Object: ForeignKey [FK_UserQuiz_Quiz] Script Date: 08/03/2012 19:36:09 ******/ ALTER TABLE [dbo].[UserQuiz] WITH CHECK ADD CONSTRAINT [FK_UserQuiz_Quiz] FOREIGN KEY([QuizID]) REFERENCES [dbo].[Quiz] ([QuizID]) GO ALTER TABLE [dbo].[UserQuiz] CHECK CONSTRAINT [FK_UserQuiz_Quiz] GO