database-design - 回答の選択肢ごとに回答者の数を取得するにはどうすればよいですか?

Question

結果を保存し、いくつかのクエリを使用して結果を取得するためのデータベースを設計する必要がある調査があります。

私が持っている現在のデータベース設計は次のとおりです。

Respondents Table: RespondentID, Name, OrgCode
Department Table: OrgCode, DepartmentName
Category Table: CategoryID, CategoryName
SubCategory Table: SubCategoryID, SubCategoryName, CategoryID
Questions Table: QuestionID, QuestionDesc, CategoryID, SubCategoryID
SubQuestions Table: SubQuestionID, SubQuestionDesc, QuestionID
Answers Table: AnswerID, AnswerDesc, QuestionID, SubQuestionID
CompleteSurvey Table: ID, RespondentID, CategoryID, AnswerID

この調査の例:

Category I
    SubCategory A
    Question 1: what do you think about the following service
        SubQuestion 1: Service #1 
            (Strongly Agree, Agree, Disagree, Strongly Disagree)
        SubQuestion 2: Service #2 
            (Strongly Agree, Agree, Disagree, Strongly Disagree)

この質問に 3 人の従業員が回答したとします。

ここで、各質問またはサブ質問で「非常に同意する」、「同意する」、「同意しない」、および「強く同意する」と答えた回答者の数を示すクエリを作成したいと思います。このデータベース設計で実行可能ですか? はいの場合、このクエリについて教えていただけますか?

また、上記のデザインよりもっとシンプルなデザインは他にもあると思いますか？はいの場合、そのうちの1つを私に勧めていただけますか？

データベース設計:

/****** Object:  Table [dbo].[Departments]    Script Date: 05/20/2012 07:26:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Departments](
    [OrgCode] [float] NOT NULL,
    [DepartmentName] [nvarchar](max) NOT NULL,
 CONSTRAINT [PK_Departments] PRIMARY KEY CLUSTERED 
(
    [OrgCode] 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
/****** Object:  Table [dbo].[Category]    Script Date: 05/20/2012 07:26:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Category](
    [CategoryID] [int] IDENTITY(1,1) NOT NULL,
    [CategoryName] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_Category] PRIMARY KEY CLUSTERED 
(
    [CategoryID] 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
/****** Object:  Table [dbo].[SubCategory]    Script Date: 05/20/2012 07:26:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[SubCategory](
    [SubCategoryID] [int] IDENTITY(1,1) NOT NULL,
    [SubCategoryName] [nvarchar](50) NOT NULL,
    [CategoryID] [int] NOT NULL,
 CONSTRAINT [PK_SubCategory] PRIMARY KEY CLUSTERED 
(
    [SubCategoryID] 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
/****** Object:  Table [dbo].[Respondents]    Script Date: 05/20/2012 07:26:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Respondents](
    [RespondentID] [nvarchar](50) NOT NULL,
    [Name] [varchar](50) NULL,
    [OrgCode] [float] NOT NULL,
 CONSTRAINT [PK_Respondents] PRIMARY KEY CLUSTERED 
(
    [RespondentID] 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
/****** Object:  Table [dbo].[Questions]    Script Date: 05/20/2012 07:26:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Questions](
    [QuestionID] [int] IDENTITY(1,1) NOT NULL,
    [QuestionDesc] [nvarchar](max) NOT NULL,
    [CategoryID] [int] NULL,
    [SubCategoryID] [int] NULL,
 CONSTRAINT [PK_Questions] PRIMARY KEY CLUSTERED 
(
    [QuestionID] 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
/****** Object:  Table [dbo].[CompleteSurvey]    Script Date: 05/20/2012 07:26:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[CompleteSurvey](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [RespondentID] [nvarchar](50) NOT NULL,
    [CategoryID] [int] NOT NULL,
    [AnswerID] [int] NOT NULL,
 CONSTRAINT [PK_CompleteSurvey] PRIMARY KEY CLUSTERED 
(
    [ID] 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
/****** Object:  Table [dbo].[SubQuestions]    Script Date: 05/20/2012 07:26:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[SubQuestions](
    [SubQuestionID] [int] IDENTITY(1,1) NOT NULL,
    [SubQuestionDesc] [nvarchar](max) NOT NULL,
    [QuestionID] [int] NULL,
 CONSTRAINT [PK_SubQuestions] PRIMARY KEY CLUSTERED 
(
    [SubQuestionID] 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
/****** Object:  Table [dbo].[Answers]    Script Date: 05/20/2012 07:26:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Answers](
    [AnswerID] [int] IDENTITY(1,1) NOT NULL,
    [AnswerDesc] [nvarchar](max) NOT NULL,
    [QuestionID] [int] NULL,
    [SubQuestionID] [int] NULL,
 CONSTRAINT [PK_Answers] PRIMARY KEY CLUSTERED 
(
    [AnswerID] 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
/****** Object:  ForeignKey [FK_SubCategory_Category]    Script Date: 05/20/2012 07:26:11 ******/
ALTER TABLE [dbo].[SubCategory]  WITH CHECK ADD  CONSTRAINT [FK_SubCategory_Category] FOREIGN KEY([CategoryID])
REFERENCES [dbo].[Category] ([CategoryID])
GO
ALTER TABLE [dbo].[SubCategory] CHECK CONSTRAINT [FK_SubCategory_Category]
GO
/****** Object:  ForeignKey [FK_Respondents_Departments]    Script Date: 05/20/2012 07:26:11 ******/
ALTER TABLE [dbo].[Respondents]  WITH CHECK ADD  CONSTRAINT [FK_Respondents_Departments] FOREIGN KEY([OrgCode])
REFERENCES [dbo].[Departments] ([OrgCode])
GO
ALTER TABLE [dbo].[Respondents] CHECK CONSTRAINT [FK_Respondents_Departments]
GO
/****** Object:  ForeignKey [FK_Questions_Category]    Script Date: 05/20/2012 07:26:11 ******/
ALTER TABLE [dbo].[Questions]  WITH CHECK ADD  CONSTRAINT [FK_Questions_Category] FOREIGN KEY([CategoryID])
REFERENCES [dbo].[Category] ([CategoryID])
GO
ALTER TABLE [dbo].[Questions] CHECK CONSTRAINT [FK_Questions_Category]
GO
/****** Object:  ForeignKey [FK_Questions_SubCategory]    Script Date: 05/20/2012 07:26:11 ******/
ALTER TABLE [dbo].[Questions]  WITH CHECK ADD  CONSTRAINT [FK_Questions_SubCategory] FOREIGN KEY([SubCategoryID])
REFERENCES [dbo].[SubCategory] ([SubCategoryID])
GO
ALTER TABLE [dbo].[Questions] CHECK CONSTRAINT [FK_Questions_SubCategory]
GO
/****** Object:  ForeignKey [FK_CompleteSurvey_Respondents]    Script Date: 05/20/2012 07:26:11 ******/
ALTER TABLE [dbo].[CompleteSurvey]  WITH CHECK ADD  CONSTRAINT [FK_CompleteSurvey_Respondents] FOREIGN KEY([RespondentID])
REFERENCES [dbo].[Respondents] ([RespondentID])
GO
ALTER TABLE [dbo].[CompleteSurvey] CHECK CONSTRAINT [FK_CompleteSurvey_Respondents]
GO
/****** Object:  ForeignKey [FK_SubQuestions_Questions]    Script Date: 05/20/2012 07:26:11 ******/
ALTER TABLE [dbo].[SubQuestions]  WITH CHECK ADD  CONSTRAINT [FK_SubQuestions_Questions] FOREIGN KEY([QuestionID])
REFERENCES [dbo].[Questions] ([QuestionID])
GO
ALTER TABLE [dbo].[SubQuestions] CHECK CONSTRAINT [FK_SubQuestions_Questions]
GO
/****** Object:  ForeignKey [FK_Answers_Questions]    Script Date: 05/20/2012 07:26:11 ******/
ALTER TABLE [dbo].[Answers]  WITH CHECK ADD  CONSTRAINT [FK_Answers_Questions] FOREIGN KEY([QuestionID])
REFERENCES [dbo].[Questions] ([QuestionID])
GO
ALTER TABLE [dbo].[Answers] CHECK CONSTRAINT [FK_Answers_Questions]
GO
/****** Object:  ForeignKey [FK_Answers_SubQuestions]    Script Date: 05/20/2012 07:26:11 ******/
ALTER TABLE [dbo].[Answers]  WITH CHECK ADD  CONSTRAINT [FK_Answers_SubQuestions] FOREIGN KEY([SubQuestionID])
REFERENCES [dbo].[SubQuestions] ([SubQuestionID])
GO
ALTER TABLE [dbo].[Answers] CHECK CONSTRAINT [FK_Answers_SubQuestions]
GO

score 1 · Accepted Answer

通常、ユーザーが実行したいタイプのクエリを実行する方法は 2 つあります。問題は非常に単純です。COUNT 集計関数を使用するだけです。ただし、選択されていない回答についてレポートする必要がある場合を除きます。集約関数と外部結合はうまく連携しません。

探している答えを得る最初の方法は、相関サブクエリを使用することです。

2 つ目の方法は、共通テーブル式(または CTE) を使用することです。

相関サブクエリは理解しやすいですが、CTE よりも効率が悪い場合があります。CTE は学習に時間がかかりますが、単純な古い SQL では解決できない問題を解決できます。

database-design - 回答の選択肢ごとに回答者の数を取得するにはどうすればよいですか?

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