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:
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?
答案 0 :(得分: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