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我需要在我的 SQL (Azure) 服务器中构建一个良好的“问答”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的方法吗？

谢谢。

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3 回答 3

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上次我做一个问答系统时，它处理了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的选择框，或文本输入（可选地限制为整数值）。

这些表看起来像这样：

-- 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

查询一直在限制 a 中允许的表数SELECT，256 左右。

于 2012-08-03T01:02:08.037 回答
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我绝对不会选择浮点数，因为它是一种非精确和非确定性的数据类型。尝试改用 bigint。据我所知，浮点数很难放入索引中。不知道 sql 数据库 (azure) 和/或 sql server 2012 虽然

于 2012-08-03T09:38:28.567 回答
0

这取决于您的问题将如何构建。

如果您有自由文本输入，并且只有一个正确答案，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。

如果您计划对一个问题提供多项选择答案，那么您希望在 Answers 表中拥有 QuestionID，而不是上面的设置。

您还可以在问题和答案之间设置一个表格，以便一个答案可以是多个问题的答案。

而且您的 ID 想要是整数，而不是浮点数；如果超出整数范围，请使用唯一标识符。浮点数不精确

于 2012-08-02T19:22:00.520 回答