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我想知道如何使用連接將此SQL重寫爲單個選擇。我有一個很長的繪製方式，如下所示，以基本獲得「項目啓動里程碑」的最短日期和「生產上線」里程碑的最長日期。我該如何讓這個過程更好？
一些背景是SQL是針對項目管理應用程序的，該項目管理應用程序針對發佈基準里程碑集跟蹤項目里程碑。我需要一個proc，它需要一個projectIDs的CSV列表，並讓它爲項目初始里程碑（StatusCode.cid = 37）和最大生產上線里程碑（StatusCode.cid = 77）選擇min startDate
這裏是我的虛擬SQL我現在有工作：
CREATE PROC rpt_rainbow
@ProjectIDs NVARCHAR(1000)
AS
DECLARE @MinBRSProjectStartDate DATETIME
DECLARE @MinBRSReleaseStartDate DATETIME
DECLARE @MaxProdProjectEndDate DATETIME
DECLARE @MaxProdReleaseEndDate DATETIME
SELECT @MinBRSProjectStartDate = MIN (pm.startDate)
FROM StatusCode sc
INNER JOIN ProjectMilestone pm ON sc.CID = pm.MilestoneCID AND pm.ProjectID IN (SELECT value FROM fn_Split(@ProjectIDs, ','))
WHERE sc.cid =37
SELECT @MinBRSReleaseStartDate = MIN(rel.startDate)
FROM Project p
INNER JOIN ReleaseSchedule rel ON rel.ReleaseID = p.ReleaseID AND rel.milestonecid IN (37)
WHERE ProjectId IN (SELECT value FROM fn_Split(@ProjectIDs, ','))
SELECT @MaxProdProjectEndDate = MAX (pm.endDate)
FROM StatusCode sc
INNER JOIN ProjectMilestone pm ON sc.CID = pm.MilestoneCID AND pm.ProjectID IN (SELECT value FROM fn_Split(@ProjectIDs, ','))
WHERE sc.cid =77
SELECT @MaxProdReleaseEndDate = MAX(rel.endDate)
FROM Project p
INNER JOIN ReleaseSchedule rel ON rel.ReleaseID = p.ReleaseID AND rel.milestonecid IN (77)
WHERE ProjectId IN (SELECT value FROM fn_Split(@ProjectIDs, ','))
select isnull(@MinBRSProjectStartDate, @MinBRSReleaseStartDate) as MinBRS_StartDate,
isnull(@MaxProdProjectEndDate, @MaxProdReleaseEndDate) as MaxProd_EndDate
這裏是我的分裂功能：
CREATE FUNCTION dbo.Split
( @Delimiter varchar(5),
@List varchar(8000)
)
RETURNS @TableOfValues table
( RowID smallint IDENTITY(1,1),
[Value] varchar(50)
)
AS
BEGIN
DECLARE @LenString int
WHILE len(@List) > 0
BEGIN
SELECT @LenString =
(CASE charindex(@Delimiter, @List)
WHEN 0 THEN len(@List)
ELSE (charindex(@Delimiter, @List) -1)
END
)
INSERT INTO @TableOfValues
SELECT substring(@List, 1, @LenString)
SELECT @List =
(CASE (len(@List) - @LenString)
WHEN 0 THEN ''
ELSE right(@List, len(@List) - @LenString - 1)
END
)
END
RETURN
END
，這裏是所涉及表的定義：
CREATE TABLE [dbo].[ProjectMilestone](
[ProjectMilestoneId] [int] NOT NULL,
[ProjectId] [int] NOT NULL,
[MilestoneCID] [int] NOT NULL,
[StartDate] [datetime] NOT NULL,
[EndDate] [datetime] NOT NULL,
[RAGStatusCID] [int] NOT NULL,
[CompletionStatusCID] [int] NOT NULL,
[StatusText] [nvarchar](max) NOT NULL,
[ReportingPriority] [int] NULL,
[Owner] [nvarchar](50) NOT NULL,
[Added] [datetime] NOT NULL,
[LastUpdate] [datetime] NOT NULL,
[UpdateBy] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_ProjectMilestone] PRIMARY KEY CLUSTERED
(
[ProjectMilestoneId] 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].[ProjectMilestone] WITH CHECK ADD CONSTRAINT [FK_ProjectMilestone_Project] FOREIGN KEY([ProjectId])
REFERENCES [dbo].[Project] ([ProjectId])
GO
ALTER TABLE [dbo].[ProjectMilestone] CHECK CONSTRAINT [FK_ProjectMilestone_Project]
-----------------------------------------------------------------------------------------------
CREATE TABLE [dbo].[Project](
[ProjectId] [int] NOT NULL,
[ProjectName] [nvarchar](255) NOT NULL,
[ProjectRegistration] [nvarchar](50) NOT NULL,
[CaseManagerBenId] [nvarchar](50) NOT NULL,
[ClarityId] [nvarchar](50) NOT NULL,
[ParentProjectId] [int] NULL,
[ReleaseId] [int] NOT NULL,
[CompletionStatusCID] [int] NOT NULL,
[ProjectTypeCID] [int] NOT NULL,
[Budget] [money] NOT NULL,
[BusinessObjective] [nvarchar](max) NOT NULL,
[Benefit] [nvarchar](max) NOT NULL,
[Added] [datetime] NOT NULL,
[LastUpdate] [datetime] NOT NULL,
[UpdateBy] [nvarchar](50) NOT NULL,
[StakeholderList] [nvarchar](1000) NULL,
CONSTRAINT [PK_Project] PRIMARY KEY CLUSTERED
(
[ProjectId] 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].[Project] WITH CHECK ADD CONSTRAINT [FK_Project_Project] FOREIGN KEY([ParentProjectId])
REFERENCES [dbo].[Project] ([ProjectId])
GO
ALTER TABLE [dbo].[Project] CHECK CONSTRAINT [FK_Project_Project]
GO
ALTER TABLE [dbo].[Project] WITH CHECK ADD CONSTRAINT [FK_Project_Release] FOREIGN KEY([ReleaseId])
REFERENCES [dbo].[Release] ([ReleaseId])
GO
ALTER TABLE [dbo].[Project] CHECK CONSTRAINT [FK_Project_Release]
--------------------------------------------------------------------------------------------
CREATE TABLE [dbo].[StatusCode](
[CID] [int] NOT NULL,
[CodeName] [nvarchar](50) NOT NULL,
[Description] [nvarchar](max) NOT NULL,
[SCID] [int] NOT NULL,
[ReportingPriority] [int] NULL,
CONSTRAINT [PK_StatusCode] PRIMARY KEY CLUSTERED
(
[CID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
--------------------------------------------------------------------------------------------
CREATE TABLE [dbo].[ReleaseSchedule](
[ReleaseScheduleID] [int] NOT NULL,
[ReleaseID] [int] NOT NULL,
[MilestoneCID] [int] NOT NULL,
[StartDate] [datetime] NOT NULL,
[EndDate] [datetime] NOT NULL,
[Added] [datetime] NOT NULL,
[LastUpdate] [datetime] NOT NULL,
[UpdateBy] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_ReleaseSchedule] PRIMARY KEY CLUSTERED
(
[ReleaseScheduleID] 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].[ReleaseSchedule] WITH CHECK ADD CONSTRAINT [FK_ReleaseSchedule_Release] FOREIGN KEY([ReleaseID])
REFERENCES [dbo].[Release] ([ReleaseId])
GO
ALTER TABLE [dbo].[ReleaseSchedule] CHECK CONSTRAINT [FK_ReleaseSchedule_Release]
你確定它現在「工作」了嗎？你正在用錯誤的方式使用SPLIT（delim/list） – RichardTheKiwi 2011-01-19 23:14:44
我目前的解決方案正在工作，但看起來很笨重，就像大猩猩（我）寫的。 – kacalapy 2011-01-20 04:40:21