SQL Server 2008检索数据查询

Question

在查询中，我想检查员工（表EMPLOYEE）是否在过去一年中每个月至少有一个期间（期间在表PERIOD中）工作。之后，我希望获得员工每个月工作日的平均时间。任何人都可以提供解决方案/解释？

职员表：

USE [MetukisDB] 
GO 

/****** Object: Table [dbo].[TblEmployee] Script Date: 05/06/2013 23:10:17 ******/ 
SET ANSI_NULLS ON 
GO 

SET QUOTED_IDENTIFIER ON 
GO 

SET ANSI_PADDING ON 
GO 

CREATE TABLE [dbo].[TblEmployee](
    [employeeNumber] [char](8) NOT NULL, 
    [employeePrivateName] [varchar](20) NOT NULL, 
    [employeeFamilyName] [varchar](20) NOT NULL, 
    [city] [varchar](20) NULL, 
    [street] [varchar](20) NULL, 
    [houseNo] [int] NULL, 
    [phoneNumber] [char](10) NULL, 
    [birthDate] [datetime] NULL, 
    [startWorkingDate] [datetime] NOT NULL, 
PRIMARY KEY CLUSTERED 
(
    [employeeNumber] 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 

ALTER TABLE [dbo].[TblEmployee] WITH CHECK ADD CHECK (([employeeNumber] like '[1-9][1-9][1-9][1-9][1-9][1-9][1-9][1-9]')) 
GO 

ALTER TABLE [dbo].[TblEmployee] WITH CHECK ADD CHECK (([houseNo]>(0))) 
GO 

ALTER TABLE [dbo].[TblEmployee] WITH CHECK ADD CHECK (([phoneNumber] like '[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]')) 
GO 

周期表：

USE [MetukisDB] 
GO 

/****** Object: Table [dbo].[TblPeriod] Script Date: 05/06/2013 23:11:46 ******/ 
SET ANSI_NULLS ON 
GO 

SET QUOTED_IDENTIFIER ON 
GO 

CREATE TABLE [dbo].[TblPeriod](
    [Number] [int] NOT NULL, 
    [fromDate] [datetime] NULL, 
    [toDate] [datetime] NOT NULL, 
PRIMARY KEY CLUSTERED 
(
    [Number] 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 

ALTER TABLE [dbo].[TblPeriod] WITH CHECK ADD CONSTRAINT [fromDate_check] CHECK (([fromDate]<=[toDate])) 
GO 

ALTER TABLE [dbo].[TblPeriod] CHECK CONSTRAINT [fromDate_check] 
GO 

ALTER TABLE [dbo].[TblPeriod] WITH CHECK ADD CONSTRAINT [Number] CHECK (([Number]>(0))) 
GO 

ALTER TABLE [dbo].[TblPeriod] CHECK CONSTRAINT [Number] 
GO 

计划表：

USE [MetukisDB] 
GO 

/****** Object: Table [dbo].[TblScheduled] Script Date: 05/07/2013 15:17:59 ******/ 
SET ANSI_NULLS ON 
GO 

SET QUOTED_IDENTIFIER ON 
GO 

SET ANSI_PADDING ON 
GO 

CREATE TABLE [dbo].[TblScheduled](
    [jobNumber] [int] NOT NULL, 
    [employeeNumber] [char](8) NOT NULL, 
    [machineNumber] [int] NOT NULL, 
    [Number] [int] NOT NULL, 
CONSTRAINT [scheduled_PK] PRIMARY KEY CLUSTERED 
(
    [jobNumber] ASC, 
    [employeeNumber] ASC, 
    [machineNumber] ASC, 
    [Number] 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 

ALTER TABLE [dbo].[TblScheduled] WITH CHECK ADD CONSTRAINT [certified_period_FK] FOREIGN KEY([jobNumber], [employeeNumber], [machineNumber]) 
REFERENCES [dbo].[TblCertified] ([jobNumber], [employeeNumber], [machineNumber]) 
ON UPDATE CASCADE 
GO 

ALTER TABLE [dbo].[TblScheduled] CHECK CONSTRAINT [certified_period_FK] 
GO 

ALTER TABLE [dbo].[TblScheduled] WITH CHECK ADD CONSTRAINT [Number_FK] FOREIGN KEY([Number]) 
REFERENCES [dbo].[TblPeriod] ([Number]) 
ON UPDATE CASCADE 
GO 

ALTER TABLE [dbo].[TblScheduled] CHECK CONSTRAINT [Number_FK] 
GO 

这是我到目前为止有：

select TblEmployee.employeeNumber 
from TblEmployee 
where(DATEDIFF(year, TblEmployee.birthDate, GETDATE())>25) 
select TblSnack.productNumber, TblProduces.machineNumber, TblCertified.employeeNumber 
from TblSnack inner join TblProduces on TblProduces.productNumber= TblSnack.productNumber 
inner join TblCertified on TblCertified.machineNumber= TblProduces.machineNumber inner join 
TblChocolate on TblChocolate.productNumber=TblProduces.productNumber 
where(TblSnack.containGluten=0) and (TblSnack.containSoy=0) 
group by TblProduces.machineNumber, TblCertified.employeeNumber, tblsnack.productNumber 
having (COUNT(TblChocolate.productNumber) > 1) 
select TblScheduled.Number, TblScheduled.employeeNumber 
from TblScheduled 
where TblScheduled.Number= (SELECT number 
FROM TblPeriod 
WHERE (MONTH(TblPeriod.fromDate)) = month (dateAdd (month,-1,GETDATE()))) 
group by TblScheduled.Number, TblScheduled.employeeNumber 

Answer 1

尝试这样的事情你的第一个问题：

-- Employees who have worked at least one period each month in the past year 
SELECT t.employeeNumber, 
t.employeeFamilyName 
FROM 
(SELECT TblEmployee.employeeNumber, 
TblEmployee.employeeFamilyName, 
COUNT(MONTH(TblPeriod.fromDate)) AS MonthCount 
FROM TblEmployee 
JOIN TblScheduled 
ON TblScheduled.employeeNumber = TblEmployee.employeeNumber 
JOIN TblPeriod 
ON TblPeriod.Number = TblScheduled.Number 
WHERE TblPeriod.fromDate >= DATEADD(YEAR,-1,GETDATE()) 
GROUP BY TblEmployee.employeeNumber, 
TblEmployee.employeeFamilyName, 
MONTH(TblPeriod.fromDate)) AS t 
WHERE t.MonthCount = 12 
GROUP BY t.employeeNumber, 
t.employeeFamilyName 

而且像这样关于第二个问题：

-- Average number of the days the employee has worked each month 
SELECT t.employeeNumber, 
t.employeeFamilyName, 
AVG(t.ScheduleCount) AS AverageCount 
FROM 
(SELECT TblEmployee.employeeNumber, 
TblEmployee.employeeFamilyName, 
MONTH(TblPeriod.fromDate) AS PeriodMonth, 
COUNT(TblScheduled.Number) AS ScheduleCount 
FROM TblEmployee 
JOIN TblScheduled 
ON TblScheduled.employeeNumber = TblEmployee.employeeNumber 
JOIN TblPeriod 
ON TblPeriod.Number = TblScheduled.Number 
WHERE TblPeriod.fromDate >= DATEADD(YEAR,-1,GETDATE()) 
GROUP BY TblEmployee.employeeNumber, 
TblEmployee.employeeFamilyName, 
MONTH(TblPeriod.fromDate)) AS t 
GROUP BY t.employeeNumber, 
t.employeeFamilyName 

注意该使用外键和主键如何加入三个表。 GROUP BY允许我们例如对TblScheduled中的条目进行计数。