Question

我需要在我的SQL（Azure）服务器中构建一个良好的“问题和答案”结构。我正在考虑这样做：

table question
    id float (we could have lots of questions, so that's why float and don't int)
    nvarchar question (question can vary in size of characters)
    id_answer float

table answer
    id float
    nvarchar answer

您认为这是一个好方法吗？我必须考虑不同类型的问题，我可能会有这样的问题：

question: Who invented the lamp ?
answer:   Thomas Edson

question: Thomas Edson invested the lamp ?
answer: No. (true or false)

你们知道其他一些好方法吗？

感谢。

Answer 1

我上一次做Q＆amp;它处理的系统由多页问题组成的调查。答案可以是复选框，单选按钮或用于多项选择或文本输入的选择框（可选择限制为整数值）。

表格看起来像这样：

-- There are pages of questions.

CREATE TABLE [dbo].[Pages] (
    [PageId] [int] IDENTITY (1, 1) NOT NULL ,
    [Name] [varchar] (128) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
    [Description] [varchar] (1024) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
    [PageTypeId] [int] NOT NULL 
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[PageTypes] (
    [PageTypeId] [int] IDENTITY (1, 1) NOT NULL ,
    [Name] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
    [Description] [varchar] (1024) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL 
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[TargetPages] (
    [QuestionId] [int] NOT NULL ,
    [PageId] [int] NOT NULL ,
    [Rank] [int] NOT NULL 
) ON [PRIMARY]
GO

-- Questions have input fields.  Perhaps a text entry, perhaps several multiple-guess choices.

CREATE TABLE [dbo].[Questions] (
    [QuestionId] [int] IDENTITY (1, 1) NOT NULL ,
    [StartDate] [datetime] NOT NULL ,
    [EndDate] [datetime] NOT NULL ,
    [Description] [varchar] (1024) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
    [Filespec] [varchar] (128) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[Fields] (
    [QuestionId] [int] NOT NULL ,
    [FieldId] [int] IDENTITY (1, 1) NOT NULL ,
    [FieldName] [varchar] (64) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
    [InputTypeId] [int] NOT NULL ,
    [Description] [varchar] (256) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL 
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[InputTypes] ( -- Roughly: checkbox, radio button, text, textarea or select list.
    [InputTypeId] [int] IDENTITY (1, 1) NOT NULL ,
    [InputTypeName] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
    [Choices] [bit] NOT NULL ,
    [NumericValue] [bit] NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[Choices] ( -- Defines radio button or select list choices for multiple choice questions.
    [FieldId] [int] NOT NULL ,
    [cName] [varchar] (64) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
    [cValue] [varchar] (64) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
    [Rank] [int] NOT NULL 
) ON [PRIMARY]
GO

-- Then we have the answers supplied by users.

CREATE TABLE [dbo].[Inquiries] ( 
    [InquiryId] [int] IDENTITY (1, 1) NOT NULL ,
    [UserId] [int] NOT NULL ,
    [QuestionId] [int] NOT NULL ,
    [dTimestamp] [datetime] NOT NULL ,
    [ResponseSequence] [int] NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[Users] (
    [UserId] [int] IDENTITY (1, 1) NOT NULL ,
    [Username] [varchar] (16) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[Responses] ( -- Multiple choice.
    [InquiryId] [int] NOT NULL ,
    [FieldId] [int] NOT NULL ,
    [FieldValue] [varchar] (1024) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL 
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[IntegerResponses] ( -- User supplied integer or multiple choice value.
-- NB: Checkbox values are handled thusly: a row here indicates the box was checked, no row is unchecked.  The value is meaningless.
    [InquiryId] [int] NOT NULL ,
    [FieldId] [int] NOT NULL ,
    [FieldValue] [int] NOT NULL 
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[TextResponses] ( -- User supplied text.
    [InquiryId] [int] NOT NULL ,
    [FieldId] [int] NOT NULL ,
    [FieldValue] [varchar] (1024) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL 
) ON [PRIMARY]
GO
exec sp_addextendedproperty N'MS_Description', N'1 ==> Values are in the   Choices   table.', N'user', N'dbo', N'table', N'InputTypes', N'column', N'Choices'
GO
exec sp_addextendedproperty N'MS_Description', N'1 ==> Values are numeric.', N'user', N'dbo', N'table', N'InputTypes', N'column', N'NumericValue'
GO

查询一直在SELECT允许的表数限制，256左右。

Answer 2

我绝对不会去浮动，因为它是一种非精确且非确定性的数据类型。尝试使用bigint代替。据我所知，浮点数很难被放入索引中。不知道sql数据库（azure）和/或sql server 2012虽然

Answer 3

这取决于您的问题将如何构建。

如果您有自由文本输入，只有一个正确的答案，那么将问题与答案分开是没有意义的，因此在问题表中有一个答案字段。但是你依赖正确的拼写等等。

如果您计划对问题进行多项选择答案，那么您希望在Answers表中使用QuestionID，而不是上面的设置。

你可以在问题和答案之间另外有一个表，所以答案可以是对多个问题的答案。

你的身份证想要成为一个整体，而不是花车;如果超出整数范围，请使用uniqueidentifiers。浮动不是精确

如何在SQL中组织问题和答案？

3 个答案: