Need Help Optizing A User Defined Function
Hi,
I posted a question sometime back about any one has written a function which converts a given date to a a new timezone.
As it turns out I have actually written the function and it is functionally sound.
the issue I am not facing is the performace.
The Algorithm is pretty simple.
step 1
I have create a table called TZ1 which has the TImezoneCODE (PST,EST..), daylightsavingsstart (DATETIME on which the daylight savings start), daylightsavingsend ( end of DLS) and offset (EG -8 for PST, -5 for EST etc)
step 2
I check the timezone and pick out corresponding start and enddate for daylight savings.
Step 3
Depending on where the date lies I create a new date by adding offset to the original datetime (+1) for the new date and then return this new datetime.
As simple as this looks the response time is 16 times than that of a select statement without the function.
Do you see something that I can tune to get a better response time.
Heres my code
================================================== ================================================== ================================================== ================================================== ==================================
CREATE FUNCTION TC3
-- drop function tc3
(@dt datetime, @Src varchar(10), @Dest varchar(10))
Returns datetime
begin
declare @v_src varchar(10)
Declare @v_dest varchar(10)
declare @V_dt datetime
declare @v_newdt datetime
declare @v_year int
declare @v_offset float
declare @v_sd datetime
declare @v_ed datetime
-- select * into TZ1 from TZ1
-- create table #tz1 (fn int)
select @v_year = datepart (year, @dt)
if (@v_year between 2000 and 2004)
begin
-- -------------------
-- PST BEgin
-- -------------------
if (@dest = 'PST')
begin
-- select * from TZ1
select @V_year = datepart (year, @dt)
select @v_offset = offset,
@v_sd = daylightsavingsstart,
@v_ed = daylightsavingsend
from TZ1
where
@V_YEAR = YEAR
and timezonecode = @dest
-- AND @DT between daylightsavingsstart and daylightsavingsend
if (@dt between @v_sd and @v_ed )
begin
-- ( select @v_newdt = dateadd (hh, -9, @dt) )
select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt)
end
else
begin
-- ( select @v_newdt = dateadd (hh, -8, @dt) )
select @v_newdt = dateadd (hh, @v_offset, @dt)
end -- if dt between daylight savings
return @v_newdt
end -- @dest=pst end
-- -------------------
-- PST END
-- -------------------
-- -------------------
-- EST BEGIN
-- -------------------
ELSE
if (@dest = 'EST')
begin
select @V_year = datepart (year, @dt)
select @v_offset = offset,
@v_sd = daylightsavingsstart,
@v_ed = daylightsavingsend
from TZ1
where
@V_YEAR = YEAR
and timezonecode = @dest
if (@dt between @v_sd and @v_ed )
begin
-- ( select @v_newdt = dateadd (hh, -9, @dt) )
select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt)
end
else
begin
-- ( select @v_newdt = dateadd (hh, -8, @dt) )
select @v_newdt = dateadd (hh, @v_offset, @dt)
end -- if dt between daylight savings
return @v_newdt
end -- @dest=Est end
-- -------------------
-- EST END
-- -------------------
-- -------------------
-- HST BEgin
-- select * from timezones
-- -------------------
else
if (@dest = 'HST')
begin
select @V_year = datepart (year, @dt)
select @v_offset = offset,
@v_sd = daylightsavingsstart,
@v_ed = daylightsavingsend
from TZ1
where
@V_YEAR = YEAR
and timezonecode = @dest
if (@dt between @v_sd and @v_ed )
begin
-- ( select @v_newdt = dateadd (hh, -9, @dt) )
select @v_newdt = dateadd (hh, CAST( @v_offset as int) , @dt)
end
else
begin
-- ( select @v_newdt = dateadd (hh, -8, @dt) )
select @v_newdt = dateadd (hh, @v_offset, @dt)
end -- if dt between daylight savings
return @v_newdt
end -- @dest=Ast end
-- -------------------
-- HST END
-- -------------------
-- -------------------
-- MST BEgin
-- select * from timezones
-- -------------------
else
if (@dest = 'MST')
begin
select @V_year = datepart (year, @dt)
select @v_offset = offset,
@v_sd = daylightsavingsstart,
@v_ed = daylightsavingsend
from TZ1
where
@V_YEAR = YEAR
and timezonecode = @dest
if (@dt between @v_sd and @v_ed )
begin
-- ( select @v_newdt = dateadd (hh, -9, @dt) )
select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt)
end
else
begin
-- ( select @v_newdt = dateadd (hh, -8, @dt) )
select @v_newdt = dateadd (hh, @v_offset, @dt)
end -- if dt between daylight savings
return @v_newdt
end -- @dest=Mst end
-- -------------------
-- MST END
-- -------------------
else
return '19990909'
end -- year end
return @v_newdt
end
================================================== ================================================== ================================================== =============================================
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Problem With User Defined Function
I wrote a UDF to get a rolling average based upon a date passed to the UDF. The error I get is: Server: Msg 102, Level 15, State 1, Procedure fn_RollAverage, Line 26 Incorrect syntax near ')'. SET QUOTED_IDENTIFIER OFF GO SET ANSI_NULLS OFF GO CREATE FUNCTION fn_RollAverage(@CURVE_DATE AS SMALLDATETIME) RETURNS @TBLRESULT TABLE (US0001M_Index AS FLOAT, US0003M_INDEX AS FLOAT, US0006M_INDEX AS FLOAT, US0012M_INDEX AS FLOAT, usswap2_index AS FLOAT, usswap3_index AS FLOAT, usswap4_index AS FLOAT, usswap5_index AS FLOAT, usswap6_index AS FLOAT, usswap7_index AS FLOAT, usswap8_index AS FLOAT, usswap9_index AS FLOAT, usswap10_index AS FLOAT, usswap11_index AS FLOAT, usswap12_index AS FLOAT, usswap13_index AS FLOAT, usswap14_index AS FLOAT, usswap15_index AS FLOAT, usswap20_index AS FLOAT, usswap25_index AS FLOAT, usswap30_index AS FLOAT) AS BEGIN DECLARE @BEG_DATE AS SMALLDATETIME SET @BEG_DATE = (@CURVE_DATE - 30) INSERT @TBLRESULT( US0001M_Index, US0003M_INDEX, US0006M_INDEX, US0012M_INDEX, usswap2_index, usswap3_index, usswap4_index, usswap5_index, usswap6_index, usswap7_index, usswap8_index, usswap9_index, usswap10_index, usswap11_index, usswap12_index, usswap13_index, usswap14_index, usswap15_index, usswap20_index, usswap25_index, usswap30_index) SELECT AVG(US0001M_Index) AS US0001M_Index, AVG(US0003M_INDEX) AS US0003M_INDEX, AVG(US0006M_INDEX) AS US0006M_INDEX, AVG(US0012M_INDEX) AS US0012M_INDEX, AVG(usswap2_index) AS usswap2_index, AVG(usswap3_index) AS usswap3_index, AVG(usswap4_index) AS usswap4_index, AVG(usswap5_index) AS usswap5_index, AVG(usswap6_index) AS usswap6_index, AVG(usswap7_index) AS usswap7_index, AVG(usswap8_index) AS usswap8_index, AVG(usswap9_index) AS usswap9_index, AVG(usswap10_index) AS usswap10_index, AVG(usswap11_index) AS usswap11_index, AVG(usswap12_index) AS usswap12_index, AVG(usswap13_index) AS usswap13_index, AVG(usswap14_index) AS usswap14_index, AVG(usswap15_index) AS usswap15_index, AVG(usswap20_index) AS usswap20_index, AVG(usswap25_index) AS usswap25_index, AVG(usswap30_index) AS usswap30_index FROM dbo.LiborSwap WHERE CURVE_DATE BETWEEN @BEG_DATE AND @CURVE_DATE RETURN END GO SET QUOTED_IDENTIFIER OFF GO SET ANSI_NULLS ON GO
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How To Run User Defined Function On Sql Server 2005
Dear all I wants to run sql server user defined function when linked two server. I have linked two sql server.There is one function called getenc().This function created on first server.What i want.I wants to run this user defined function on the second sql server. can any one help me? Regards Jerminxxx
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How Can I Get Current Year In The User Defined Function.
I have a user defined function in datebase SQL 2000. function looks like create function Getcurrentdate(@month int, @day int) returns smalldatetimebegin declare date1 as smalldatetime--get current year --convert month, day and year into current date. then return return date1end my problem was , after using getDate(). I get error meassage which is "can'not use getDate() inside user function"How can I get current year in the user defined function. Thanks
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Stored Proc Vs User-defined Function
Dear all,After reading the Book Online, I am still confued by when to use store proc or user-defined function. The most obvious different for me is that 1. UDF can return a table eg select * from dbo.UDF(a, b , c) In real word application, what factor should i consider?Also, any debug tools in sql server ?Ad_dee
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Error Notification From User Defined Function
Is there any reason why I shouldn't cause an arithmetic error(say bydividing by zero) in a User Defined Function for a situation where in astored procedure you would use RAISERROR or in code you would throw anexception?In most situations, I can check the return value of the UDF to see thatit is valid. However, I want to sum the output of UDF and thereforecannot check the return value. Errors should be so rare that I wouldrather not use a cursor to do the sum--and take the peformance hit.Following is the code:SELECT SUM([dbo].[udf_MyFunction]([Column1],[Column2]))FROM tblMyTableThanks ~ Matt
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Incorrect Syntax In User-defined Function
In the script below is the DDL to create some tables and a UDF.What I'm interested in is the UDF at the end. Specifically, these fewlines:--CLOSE OTRate--DEALLOCATE OTRateELSE-- @NumRecords <= 0If I uncommment CLOSE and DEALLOCATE and check the syntax I get amessage:"Incorrect syntax near keyword ELSE"Being a good little footsoldier, I want to release resourcesexplicitly, but clearly I'm putting the CLOSE and DEALLOCATE statementsin the wrong place.Could someone please tell me where I ought to put them so that thecursor is CLOSEd and DEALLOCATEd correctly.By the way, I am not after negative comments on the data design, or thelogic (or lack of it) in the function, just why the syntax erroroccurs.Thanks as everEdwardif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[Employee]') and OBJECTPROPERTY(id, N'IsUserTable') =1)drop table [dbo].[Employee]GOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[PurchaseOrder]') and OBJECTPROPERTY(id,N'IsUserTable') = 1)drop table [dbo].[PurchaseOrder]GOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[TimesheetItem]') and OBJECTPROPERTY(id,N'IsUserTable') = 1)drop table [dbo].[TimesheetItem]GOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[Work]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)drop table [dbo].[Work]GOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[WorkOTRate]') and OBJECTPROPERTY(id, N'IsUserTable')= 1)drop table [dbo].[WorkOTRate]GOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[WorkOTRateDefaults]') and OBJECTPROPERTY(id,N'IsUserTable') = 1)drop table [dbo].[WorkOTRateDefaults]GOCREATE TABLE [dbo].[Employee] ([EmployeeID] [int] IDENTITY (1, 1) NOT NULL ,[UserName] [varchar] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NOTNULL ,[Title] [varchar] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,[FirstName] [varchar] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NOTNULL ,[Surname] [varchar] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,[DepartmentID] [int] NOT NULL ,[JobDescription] [varchar] (100) COLLATE SQL_Latin1_General_CP1_CI_ASNULL ,[StartDate] [smalldatetime] NOT NULL ,[EndDate] [smalldatetime] NULL ,[DefaultRatePerHour] [smallmoney] NULL ,[EmailAddress] [varchar] (100) COLLATE SQL_Latin1_General_CP1_CI_ASNULL ,[UserGroupID] [int] NOT NULL ,[Password] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,[LastLogon] [datetime] NULL ,[PasswordChange] [smalldatetime] NULL ,[PreviousPassword1] [varchar] (50) COLLATESQL_Latin1_General_CP1_CI_AS NULL ,[PreviousPassword2] [varchar] (50) COLLATESQL_Latin1_General_CP1_CI_AS NULL ,[PreviousPassword3] [varchar] (50) COLLATESQL_Latin1_General_CP1_CI_AS NULL ,[PreviousPassword4] [varchar] (50) COLLATESQL_Latin1_General_CP1_CI_AS NULL ,[PreviousPassword5] [varchar] (50) COLLATESQL_Latin1_General_CP1_CI_AS NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[PurchaseOrder] ([WorkOrderID] [int] IDENTITY (1, 1) NOT NULL ,[WorkID] [int] NOT NULL ,[OrderNo] [varchar] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,[OrderDate] [datetime] NOT NULL ,[OrderValue] [money] NOT NULL ,[FixedPrice] [bit] NOT NULL ,[Prepaid] [bit] NOT NULL ,[AllocatedHours] [int] NULL ,[RatePerHour] [money] NULL ,[Summary] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,[Notes] [varchar] (200) COLLATE SQL_Latin1_General_CP1_CI_AS NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[TimesheetItem] ([ItemID] [int] IDENTITY (1, 1) NOT NULL ,[EmployeeID] [int] NOT NULL ,[TypeID] [int] NOT NULL ,[Start] [smalldatetime] NOT NULL ,[DurationMins] [int] NOT NULL ,[WorkID] [int] NULL ,[WorkComponentID] [int] NULL ,[WorkItemID] [int] NULL ,[Notes] [varchar] (256) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,[OffSite] [tinyint] NULL ,[TravelTo] [smalldatetime] NULL ,[TravelToMins] [int] NULL ,[TravelFrom] [smalldatetime] NULL ,[TravelFromMins] [int] NULL ,[TravelMileage] [int] NULL ,[NonChargeableMins] [int] NULL ,[OTAuthorisedID] [int] NULL ,[OTAuthorisedDate] [smalldatetime] NULL ,[Abroad] [bit] NULL ,[InconvAllowance] [char] (1) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,[ApprovalID] [int] NULL ,[AprovalDate] [smalldatetime] NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[Work] ([WorkID] [int] IDENTITY (1, 1) NOT NULL ,[WorkTypeID] [int] NULL ,[WorkCode] [varchar] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOTNULL ,[Summary] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,[Notes] [varchar] (200) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,[Chargeable] [bit] NOT NULL ,[Complete] [bit] NOT NULL ,[ClientID] [int] NULL ,[ClientContactID] [int] NULL ,[Entered] [smalldatetime] NULL ,[ApprovalRequired] [tinyint] NULL ,[ColorCode] [varchar] (6) COLLATE SQL_Latin1_General_CP1_CI_AS NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[WorkOTRate] ([WorkOTRateID] [int] IDENTITY (1, 1) NOT NULL ,[WorkID] [int] NOT NULL ,[WorkDay] [int] NOT NULL ,[TimeFrom] [datetime] NOT NULL ,[TimeTo] [datetime] NOT NULL ,[RateMultiplier] [float] NOT NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[WorkOTRateDefaults] ([PKID] [int] IDENTITY (1, 1) NOT NULL ,[WorkDay] [int] NOT NULL ,[TimeFrom] [datetime] NULL ,[TimeTo] [datetime] NULL ,[RateMultiplier] [float] NOT NULL) ON [PRIMARY]GOSET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS OFFGO/*Function to determine the actual cost, in minutes, of a particularsegment of work. This is what it does, or is supposed to do.1. From the PARAMETER WorkID, determine the conclusion of the workblock associated with the TimesheetID - i.e. StartTime + DurationMins2. Establish whether there are records in the WorkOTRate tablecorresponding to this particular WorkID, weekday and time period3. If there are, get the amount of minutes by which the work blockcoincides.4. If there are no such records, get the default values from theWorkOTRateDefaults table5. If the block doesn't cross any boundaries then it's just regularwork, so just count the minutes.25/08/2005 EC*/CREATE FUNCTION fnGetWorkCostPerTimesheetItem(@TimesheetID int)RETURNS floatASBEGINDECLARE@OTRateTimeFrom datetime,@OTRateTimeTo as datetime,@OTRateMultiplier as float,@EndTime datetime,@ReturnValue as float,@OrderRatePerHour as money,@EmployeeRatePerHour as smallmoney,@NumRecords as int,@WorkID as int,@EmployeeID as int,@StartTime as smalldatetime,@Duration as int,@Found as int,@Chargeable as bit-- Get the various bits and bobs needed for the calculationSET @ReturnValue = 0SET @Found = 0SELECT@WorkID = WorkID,@EmployeeID = EmployeeID,@StartTime = Start,@Duration = DurationMinsFROMTimesheetItemWHEREItemID = @TimesheetID-- If this work is NOT chargeable, return 0SELECT@Chargeable = ChargeableFROM[Work]WHEREWorkID = @WorkIDIF @Chargeable = 1BEGINSET @EndTime = DATEADD(mi, @Duration, @StartTime)-- Get the rate per hour for this workSELECT@OrderRatePerHour = RatePerHourFROMPurchaseOrderWHEREWorkID = @WorkID-- Get the rate per hour for the employeeSELECT@EmployeeRatePerHour = DefaultRatePerHourFROMEmployeeWHERE(EmployeeID = @EmployeeID)-- Find out if there's an OT Rate set up for this WorkIDSELECT@NumRecords = Count(*)FROMWorkOTRateWHERE((WorkID = @WorkID) AND(WorkDay = DATEPART(dd, @StartTime)))IF @NumRecords > 0BEGINDECLARE OTRate CURSOR FORSELECTTimeFrom,TimeTo,RateMultiplierFROMWorkOTRateWHERE((WorkID = @WorkID) AND(WorkDay = DATEPART(dw, @StartTime)))OPEN OTRateFETCH NEXT FROM OTRate INTO @OTRateTimeFrom, @OTRateTimeTo,@OTRateMultiplierWHILE (@@fetch_status=0)BEGIN-- Set the two time values so that they match the date underconsideration.SET @OTRateTimeFrom = DATEADD(dd, DATEDIFF(dd, @OTRateTimeFrom,@StartTime) ,@OTRateTimeFrom)SET @OTRateTimeTo = DATEADD(dd, DATEDIFF(dd, @OTRateTimeTo ,@StartTime) ,@OTRateTimeTo)-- If the TimeTo part is < TimeFrom, then we know it crosses atime boundaryIF @OTRateTimeTo < @OTRateTimeFromSET @OTRateTimeTo = DATEADD(dd, 1, @OTRateTimeTo)-- If the time is between midnight and 8 a.m. it's the "next"dayIF CONVERT(datetime, @OTRateTimeFrom, 108) BETWEEN '00:00' AND'08:00'SET @OTRateTimeFrom = DATEADD(dd, 1, @OTRateTimeFrom)IF CONVERT(datetime, @OTRateTimeTo, 108) BETWEEN '00:00' AND'08:00'SET @OTRateTimeTo = DATEADD(dd, 1, @OTRateTimeTo)/*Ok, now we're in business. There are four possible scenariosthat we are interested in (ignoring when the Timesheet item period isentirely outside the OT rate period)NUMBER 1S EOT OTNUBMER 2S EOT OTNUMBER 3S EOT OTNUBMER 4S EOT OT*/-- NUMBER 1IF (@StartTime < @OTRateTimeFrom) AND (@EndTime > @OTRateTimeTo)BEGINSET @ReturnValue = @ReturnValue + (((DATEDIFF(mi,@OTRateTimeFrom, @OTRateTimeTo)) * @OTRateMultiplier))SET @Found = 1END--NUMBER 2ELSE IF (@StartTime < @OTRateTimeFrom) AND (@EndTime BETWEEN@OTRateTimeFrom AND @OTRateTimeTo)BEGINSET @ReturnValue = @ReturnValue + (((DATEDIFF(mi,@OTRateTimeFrom, @EndTime)) * @OTRateMultiplier))SET @Found = 1END-- NUMBER 3IF (@StartTime BETWEEN @OTRateTimeFrom AND @OTRateTimeTo) AND(@EndTime > @OTRateTimeTo)BEGINSET @ReturnValue = @ReturnValue + (((DATEDIFF(mi, @StartTime,@OTRateTimeTo)) * @OTRateMultiplier))SET @Found = 1END--NUMBER 4ELSE IF (@StartTime BETWEEN @OTRateTimeFrom AND @OTRateTimeTo)AND (@EndTime BETWEEN @OTRateTimeFrom AND @OTRateTimeTo)BEGINSET @ReturnValue = @ReturnValue + (((DATEDIFF(mi, @StartTime,@EndTime)) * @OTRateMultiplier))SET @Found = 1ENDFETCH NEXT FROM OTRate INTO @OTRateTimeFrom, @OTRateTimeTo,@OTRateMultiplierENDEND--CLOSE OTRate--DEALLOCATE OTRateELSE-- @NumRecords <= 0BEGINDECLARE OTRate CURSOR FORSELECTTimeFrom,TimeTo,RateMultiplierFROMWorkOTRateDefaultsWHERE(WorkDay = DATEPART(dw, @StartTime))OPEN OTRateFETCH NEXT FROM OTRate INTO @OTRateTimeFrom, @OTRateTimeTo,@OTRateMultiplierWHILE (@@fetch_status=0)BEGIN-- Set the two time values so that they match the date underconsideration.SET @OTRateTimeFrom = DATEADD(dd, DATEDIFF(dd, @OTRateTimeFrom,@StartTime) ,@OTRateTimeFrom)SET @OTRateTimeTo = DATEADD(dd, DATEDIFF(dd, @OTRateTimeTo ,@StartTime) ,@OTRateTimeTo)-- If the TimeTo part is < TimeFrom, then we know it crosses atime boundaryIF @OTRateTimeTo < @OTRateTimeFromSET @OTRateTimeTo = DATEADD(dd, 1, @OTRateTimeTo)-- If the time is between midnight and 8 a.m. it's the "next"dayIF CONVERT(datetime, @OTRateTimeFrom, 108) BETWEEN '00:00' AND'08:00'SET @OTRateTimeFrom = DATEADD(dd, 1, @OTRateTimeFrom)IF CONVERT(datetime, @OTRateTimeTo, 108) BETWEEN '00:00' AND'08:00'SET @OTRateTimeTo = DATEADD(dd, 1, @OTRateTimeTo)/*Ok, now we're in business. There are four possible scenariosthat we are interested in (ignoring when the Timesheet item period isentirely outside the OT rate period)NUMBER 1S EOT OTNUBMER 2S EOT OTNUMBER 3S EOT OTNUBMER 4S EOT OT*/-- NUMBER 1IF (@StartTime < @OTRateTimeFrom) AND (@EndTime > @OTRateTimeTo)BEGINSET @ReturnValue = @ReturnValue + (((DATEDIFF(mi,@OTRateTimeFrom, @OTRateTimeTo)) * @OTRateMultiplier))SET @Found = 1END--NUMBER 2ELSE IF (@StartTime < @OTRateTimeFrom) AND (@EndTime BETWEEN@OTRateTimeFrom AND @OTRateTimeTo)BEGINSET @ReturnValue = @ReturnValue + (((DATEDIFF(mi,@OTRateTimeFrom, @EndTime)) * @OTRateMultiplier))SET @Found = 1END-- NUMBER 3IF (@StartTime BETWEEN @OTRateTimeFrom AND @OTRateTimeTo) AND(@EndTime > @OTRateTimeTo)BEGINSET @ReturnValue = @ReturnValue + (((DATEDIFF(mi, @StartTime,@OTRateTimeTo)) * @OTRateMultiplier))SET @Found = 1END--NUMBER 4ELSE IF (@StartTime BETWEEN @OTRateTimeFrom AND @OTRateTimeTo)AND (@EndTime BETWEEN @OTRateTimeFrom AND @OTRateTimeTo)BEGINSET @ReturnValue = @ReturnValue + (((DATEDIFF(mi, @StartTime,@EndTime)) * @OTRateMultiplier))SET @Found = 1ENDFETCH NEXT FROM OTRate INTO @OTRateTimeFrom, @OTRateTimeTo,@OTRateMultiplierENDENDCLOSE OTRateDEALLOCATE OTRate-- If there were no matching OT records, it's just a regular blockof work in normal hoursIF @Found = 0SET @ReturnValue = @DurationEND-- Finally we factor in the relation between the Employee's rate andthe Order's stated rate.RETURN (@ReturnValue * (@EmployeeRatePerHour / @OrderRatePerHour))ENDGOSET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS ONGO
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Stored Procedure - User Defined Function.
Hi.I'm really new to MSSQL, so therefore my question can sound stupid.Is it possible to use a function written in a module in MS-ACCESS in astored procedure?Or how can it be done, it is a complicated function with loop and more.I'll appreciate all answers also negatives ones.TIAJřrn
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Storing Variables From A User-defined Function
I've looked all over but can't find a solid answer. I've got afunction that runs from a View and when the function runs the firsttime it is calculating a Temperature for a group of Formulas. What Iwant to do is calculate this temperature in the UDF on the first passand store it somewhere (table, global variable etc.). On everyexecution after that I'd like to use the value stored so I don't haveto recalculate the value again for the specific group defined.I've looked at storing the data in a table from the UDF but UDF'sdon't support dynamic SQL statements and can't run a stored procedure.The key here is we have a view that calls a UDF (user-definedfunction). Using SQL 2000.Any ideas would be very helpful. Thanks.
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Optimization Required For User Defined Function
Hi, I've an UDF which inside has two query joined by union and it 's similar to this select * from Table1 .... (several conditions) union select * from Table2 .... (several conditions) (this could takes long time to run) Since i can't write dynamic sql into UDF , i can't avoid to insert Table2 into the query but to improve permormance I've seen how costant can help me. For Example if I change my UDF in select * from Table1 .... (several conditions) union select * from Table2 Where 1=2 AND (several conditions) Optimazer is able to skip completely the second execution, so i need to transform 1=2 into a dynamic condition for example test a field table existence. select * from Table2 Where Exist (select * from Table3 where Field1=1) That is why i try to write a single UDF can adapt itself to several situations using second condition only where is necessary and not always. The problem is the dynamic condition for simple could be, wasn't recognize as costant. For Example select top 1 * from MyTable where (select 1)=2 select top 1 * from MyTable where 1=2 If you see the execution plan of these 2 queries you could see that the first takes more than 80% of execution time and in the second less than 20%. Moreover the second plan use a costant scan unlike the first doesn't it. Do anyone know a way to tell to optimizer to use a simple condition as constant ? This improve drastically my UDF performance..... :( :( Thanks.
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Can We Use A Variable As An Argument In A User Defined Function
Hi, I have written a user defined function to convert a date from an OLD time zone to NEW time Zone. The three parameters are (date, OLDTz,NEWTZ). ===================================== declare @v_tz varchar(10) , @v_da integer, @v_ss varchar(100) select @v_da=7 select @v_tz='GMT' select @v_ss='soumilpatel' select substring('soumilpatel',2,3) select substring(@v_ss,2,3) select getdate(), dateadd(day, 7, getdate()), dateadd(day, @v_da, getdate()) select top 2 timestampwhenset, dbo.tc(timestampwhenset,'GMT','PST') from s_monitorevents select top 2 timestampwhenset, dbo.tc(timestampwhenset,'GMT', @v_tz ) from s_monitorevents go ===================================== In real life the value of @v_tz is coming from a table. How do I go about resolving the value of the variable before I run the function. I was able to use the variable substitution successfully in a numeric function as well as in a string/character function. Your input is very much appreciated. -soumil
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User-Defined-Function With-in Stored-Procedure??
Does MS-SQL allow us to create an user-defined function within the stored-procedure script? I have been getting errors. It's my first time using the user-defined function with stored-procedure. I welcome your help. Code: CREATE FUNCTION ftnVehicleYearFormattor (@sValue VARCHAR(2)) RETURNS VARCHAR(2) AS BEGIN IF (LEN(@sValue) < 2) SET @sValue = '0' + @sValue RETURN @sValue END Thanks...
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