Question

我正在开发一个简单的Web应用程序，为用户提供测验。由于我是ASP.NET世界的新手，我正在关注如何在ASP.net网站上构建测验引擎视频系列。我的数据库设计类似于这些视频中使用的设计。这是link of the first video：一切正常，但我现在想开发一个查询，帮助我向管理员显示统计数据，显示：

系统中的测验总数
每个测验的参与者总数
每日，每周，每月和每年（如果可能）的参与者总数

为了澄清最后一点，我希望管理员看到以下内容：

上周参与者穿戴的总人数为：......
上周采取的测验总数为：.........
上个月的测验总数为：.........

我认为这样的事情对于了解系统的使用情况非常有用，并向管理人员展示系统在copmany中的效率。

数据库的sechma：

CREATE TABLE [dbo].[Quiz](
    [QuizID] [int] IDENTITY(1,1) NOT NULL,
    [Title] [varchar](max) NOT NULL,
    [Description] [varchar](max) 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]) VALUES (6, N'Safety', N'General Safety Test')
INSERT [dbo].[Quiz] ([QuizID], [Title], [Description]) VALUES (7, N'my title', N'my description')
INSERT [dbo].[Quiz] ([QuizID], [Title], [Description]) VALUES (9, N'General Safety Quiz2', N'Testing')
INSERT [dbo].[Quiz] ([QuizID], [Title], [Description]) VALUES (10, N'General Safety Quiz3', N'Testing #2')
SET IDENTITY_INSERT [dbo].[Quiz] OFF


/****** Object:  Table [dbo].[Question]    Script Date: 11/17/2011 00:44:38 ******/

CREATE TABLE [dbo].[Question](
    [QuestionID] [int] IDENTITY(1,1) NOT NULL,
    [Question] [varchar](max) NOT NULL,
    [Answer1] [varchar](max) NOT NULL,
    [Answer2] [varchar](max) NOT NULL,
    [Answer3] [varchar](max) NOT NULL,
    [Answer4] [varchar](max) NOT NULL,
    [CorrectAnswer] [tinyint] NOT NULL,
    [AnswerExplanation] [varchar](max) NULL,
    [QuestionOrder] [tinyint] NOT NULL,
    [QuizID] [int] NOT NULL,
 CONSTRAINT [PK_Question] 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
SET ANSI_PADDING OFF
GO
SET IDENTITY_INSERT [dbo].[Question] ON
INSERT [dbo].[Question] ([QuestionID], [Question], [Answer1], [Answer2], [Answer3], [Answer4], [CorrectAnswer], [AnswerExplanation], [QuestionOrder], [QuizID]) VALUES (4, N'What is your name?', N'Mohammed ', N'Ali', N'Hassan', N'Husain', 1, N'My Name', 1, 6)
INSERT [dbo].[Question] ([QuestionID], [Question], [Answer1], [Answer2], [Answer3], [Answer4], [CorrectAnswer], [AnswerExplanation], [QuestionOrder], [QuizID]) VALUES (7, N'What is the definition of Safety?', N'Being Safe', N'Being in danger', N'Be careful', N'be careless', 1, N'Nothing', 1, 9)
INSERT [dbo].[Question] ([QuestionID], [Question], [Answer1], [Answer2], [Answer3], [Answer4], [CorrectAnswer], [AnswerExplanation], [QuestionOrder], [QuizID]) VALUES (8, N'What is the definition of Safety? ', N'Being Safe', N'Being Careless', N'Being Careful', N'Being in Dangerous', 1, N'Nothing to say', 1, 10)
SET IDENTITY_INSERT [dbo].[Question] OFF
/****** Object:  Table [dbo].[UserQuiz]    Script Date: 11/17/2011 00:44:38 ******/
CREATE TABLE [dbo].[UserQuiz](
    [UserQuizID] [int] NULL,
    [QuizID] [int] NOT NULL,
    [DateTimeComplete] [smalldatetime] NOT NULL,
    [Score] [tinyint] NOT NULL,
    [Username] [nvarchar](256) NOT NULL
) ON [PRIMARY]
GO
INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (NULL, 6, CAST(0x9F8F02D8 AS SmallDateTime), 100, N'SMP\ALMARHMS')
INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (NULL, 6, CAST(0x9F8F02E3 AS SmallDateTime), 50, N'SMP\ALMARHMS')
INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (NULL, 6, CAST(0x9F8F0333 AS SmallDateTime), 50, N'SMP\ALMARHMS')
INSERT [dbo].[UserQuiz] ([UserQuizID], [QuizID], [DateTimeComplete], [Score], [Username]) VALUES (NULL, 7, CAST(0x9F8F0335 AS SmallDateTime), 100, N'SMP\ALMARHMS')

在这个伟大社区的其中一个人的帮助下，我想出了一个查询，显示每个测验中的参与者数量。这是查询：

SELECT     Q.QuizID, Q.Title, COUNT(*) AS Users
                                   FROM       dbo.UserQuiz AS UQ 
                                   INNER JOIN dbo.Quiz AS Q ON Q.QuizID = UQ.QuizID
                                   GROUP BY Q.QuizID, Q.Title

现在我需要对其进行修改或提出新的查询，以便给出以上三点。我怎么能这样做？

Answer 1

如果您想计算过去7天和过去30天，可以使用以下内容：

-- Count of Participants in the last 7 days 
SELECT COUNT(DISTINCT Q.UserName) 
FROM dbo.UserQuiz Q 
WHERE DateTimeComplete >= DATEADD(dd, -7, DATEADD(day, DATEDIFF(day, 0, GETDATE()), 0)) 

-- Count quizzes taken in the last 7 days 
SELECT COUNT(Q.QuizID) 
FROM dbo.UserQuiz Q 
WHERE Q.DateTimeComplete >= DATEADD(dd, -7, DATEADD(day, DATEDIFF(day, 0, GETDATE()), 0)) 

-- Count quizzes taken in the last 30 days 
SELECT COUNT(Q.QuizID) 
FROM dbo.UserQuiz Q 
WHERE Q.DateTimeComplete >= DATEADD(dd, -30, DATEADD(day, DATEDIFF(day, 0, GETDATE()), 0))

请注意，如果您想计算日历周和日历月，那么您需要做更多工作来过滤正确的开始和结束日期过滤器。

编辑：修复了查询语法（在SSMS中未运行时发布的第一个答案）我也没注意到UserQuiz.UserQuizID可以为空。因此，这一专栏不是我所期望的那样。

编辑＃2：根据OP的请求，也可以使用子选择在单个查询中检索这三个统计信息。由于过滤标准或计算每个统计数据（或两者）所涉及的聚合存在差异，因此必须进行子选择。

-- Combine three stats into one query using sub-selects...
SELECT
(SELECT COUNT(DISTINCT Q.UserName)  
 FROM dbo.UserQuiz Q  
 WHERE DateTimeComplete >= DATEADD(dd, -7, DATEADD(day, DATEDIFF(day, 0, GETDATE()), 0)))
 as ParticipantsLast7Days,
(SELECT COUNT(Q.QuizID)  
 FROM dbo.UserQuiz Q  
 WHERE Q.DateTimeComplete >= DATEADD(dd, -7, DATEADD(day, DATEDIFF(day, 0, GETDATE()), 0)))
 as QuizzesLast7Days,
(SELECT COUNT(Q.QuizID)  
 FROM dbo.UserQuiz Q  
 WHERE Q.DateTimeComplete >= DATEADD(dd, -30, DATEADD(day, DATEDIFF(day, 0, GETDATE()), 0)))
 as QuizzesLast30Days

如何提出显示测验总数，参与者总数的统计数据？

1 个答案: