来个高手帮小弟我解释下下面的视图 详细点 只剩10分了 多谢了
日期：2014-05-18 浏览次数：20567 次
来个高手帮我解释下下面的视图 详细点 只剩10分了 谢谢了
CREATE view vw_ExpenseClaimAutoMilesDetail
AS
SELECT [FID],row_number() over (order by FExpenseClaimID) as lblID_AM,
[FBeginOdometer],'' as FDate,[FEndOdometer],
(FEndOdometer-FBeginOdometer) as TotalMiles,[FBusinessMilesDriven],
(FEndOdometer-FBeginOdometer-FBusinessMilesDriven) as PersonalMilesDriven,
(select top 1 FUserID from dbo.TB_RC_ExpenseClaim where FExpenseClaimID=a.FExpenseClaimID and FInactivateDate is null)
as FUserID
,'' as FUserName
,cast
(
(
case when (FEndOdometer-FBeginOdometer)=0 then 0 else Convert(decimal(18,2),(FEndOdometer-FBeginOdometer-FBusinessMilesDriven)*100/(FEndOdometer-FBeginOdometer)) end) AS varchar(500))+'%'
as FPersonalPercent
,[FRemarks]
,[FExpenseClaimID]
,[FinactivateDate]
FROM [dbo].[ExpenseClaimAutoMilesDetail] a where FInactivateDate is null
GO
------解决方案--------------------
CREATE view vw_ExpenseClaimAutoMilesDetail
AS
SELECT [FID],row_number() over (order by FExpenseClaimID) as lblID_AM,
[FBeginOdometer],'' as FDate,[FEndOdometer],
(FEndOdometer-FBeginOdometer) as TotalMiles,[FBusinessMilesDriven],
(FEndOdometer-FBeginOdometer-FBusinessMilesDriven) as PersonalMilesDriven,
(select top 1 FUserID from dbo.TB_RC_ExpenseClaim where FExpenseClaimID=a.FExpenseClaimID and FInactivateDate is null)
as FUserID
,'' as FUserName
,cast
(
(
case when (FEndOdometer-FBeginOdometer)=0 then 0 else Convert(decimal(18,2),(FEndOdometer-FBeginOdometer-FBusinessMilesDriven)*100/(FEndOdometer-FBeginOdometer)) end) AS varchar(500))+'%'
as FPersonalPercent
,[FRemarks]
,[FExpenseClaimID]
,[FinactivateDate]
FROM [dbo].[ExpenseClaimAutoMilesDetail] a where FInactivateDate is null
GO
------解决方案--------------------
- SQL code
CREATE view vw_ExpenseClaimAutoMilesDetail
AS
SELECT [FID],
row_number() over (order by FExpenseClaimID) as lblID_AM,--按FExpenseClaimID升序的排列序号，别名为lblID_AM
[FBeginOdometer],
'' as FDate,--FDate列，值为''
[FEndOdometer],
(FEndOdometer-FBeginOdometer) as TotalMiles,--FEndOdometer与FBeginOdometer的差值，列名TotalMiles
[FBusinessMilesDriven],
(FEndOdometer-FBeginOdometer-FBusinessMilesDriven) as PersonalMilesDriven,--三个的差值，列名PersonalMilesDriven
(select top 1 FUserID from dbo.TB_RC_ExpenseClaim where FExpenseClaimID=a.FExpenseClaimID and FInactivateDate is null)
as FUserID--子查询，从TB_RC_ExpenseClaim取第一条与当前记录的FExpenseClaimID相同的，且FInactivateDate为空的FUserID，并给出列名FUserID
,'' as FUserName--FUserName列，值''
,cast
(
(
case when (FEndOdometer-FBeginOdometer)=0 then 0 else Convert(decimal(18,2),(FEndOdometer-FBeginOdometer-FBusinessMilesDriven)*100/(FEndOdometer-FBeginOdometer)) end) AS varchar(500))+'%'
as FPersonalPercent--当FEndOdometer-FBeginOdometer相同时，取0，不同时，取FEndOdometer-FBeginOdometer-FBusinessMilesDriven占FEndOdometer-FBeginOdometer的百分比，列名FPersonalPercent
,[FRemarks]
,[FExpenseClaimID]
,[FinactivateDate]
FROM [dbo].[ExpenseClaimAutoMilesDetail] a where FInactivateDate is null
GO
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