Handling Large Queries In A Table Valued User Defined Function
May 20, 2008
Hello,
We have created several Table Valued User Defined Functions in a Production SQL Server 2005 DB that are returning large (tens of thousands of) rows obtained through a web service. Our code is based on the MSDN article Extending SQL Server Reporting Services with SQL CLR Table-Valued Functions .
What we have found in our implementations of variations of this code on three seperate servers is that as the rowset grows, the length of time required to return the rows grows exponentially. With 10 columns, we have maxed out at approximately 2 500 rows. Once our rowset hit that size, no rows were being returned and the queries were timing out.
Here is a chart comparing the time elapsed to the rows returned at that time for a sample trial i ran:
Sec / Actual Rows Returned
0 0
10 237
20 447
30 481
40 585
50 655
60 725
70 793
80 860
90 940
100 1013
110 1081
120 1115
130 1151
140 1217
150 1250
160 1325
170 1325
180 1430
190 1467
200 1502
210 1539
220 1574
230 1610
240 1645
250 1679
260 1715
270 1750
280 1787
290 1822
300 1857
310 1892
320 1923
330 1956
340 1988
350 1988
360 2022
370 2060
380 2094
390 2094
400 2130
410 2160
420 2209
430 2237
440 2237
450 2274
460 2274
470 2308
480 2342
490 2380
500 2380
510 2418
520 2418
530 2451
540 2480
550 2493
560 2531
570 2566
It took 570 seconds (just over 9 1/2 minutes to return 2566 rows).
The minute breakdown during my trial is as follows:
1 = 655 (+ 655)
2 = 1081 (+ 426)
3 = 1325 (+244)
4 = 1610 (+285)
5 = 1822 (+212)
6 = 1988 (+166)
7 = 2160 (+172)
8 = 2308 (+148)
9 = 2451 (+143)
As you can tell, except for a few discrepancies to the resulting row count at minutes 4 and 7 (I will attribute these to timing as the results grid in SQL Management Studio was being updated once every 5 seconds or so), as time went on, fewer and fewer rows were being returned in a given time period. This was a "successful" run as the entire rowset was returned but on more than several occasions, we have reached the limit and have had 0 new rows per minute towards the end of execution.
Allow me to explain the code in further detail:
[SqlFunction(FillRowMethodName = "FillListItem")]
public static IEnumerable DiscoverListItems(...)
{
ArrayList listItems = new ArrayList();
SPToSQLService service = new SPToSQLService();
[...]
DataSet itemQueryResult = service.DoItemQuery(...); // This is a synchronous call returning a DataSet from the Web Service
//Load the DS to the ArrayList
return listItems;
}
public static void FillListItem(object obj, out string col1, out string col2, out string col3, ...)
{
ArrayList item = (ArrayList) obj;
col1 = item.Count > 0 ? (string) item[0] : "";
col2 = item.Count > 0 ? (string) item[1] : "";
col3 = item.Count > 0 ? (string) item[2] : "";
[...]
}
As you will notice, the web service is called, and the DataSet is loaded to an ArrayList object (containing ArrayList objects), before the main ArrayList is returned by the UDF method. There are 237 rows returned within 10 seconds, which leads me to believe that all of this has occured within 10 seconds. The method GetListItems has executed completely and the ArrayList is now being iterated through by the code calling the FillListItem method. I believe that this code is causing the result set to be returned at a decreasing rate. I know that the GetListItems code is only being executed once and that the WebService is only being called once.
Now alot of my larger queries ( > 20 000 rows) have timed out because of this behaviour, and my workaround was to customize my web service to page the data in reasonable chunks and call my UDF's in a loop using T-SQL. This means calling the Web Service up to 50 times per query in order to return the result set.
Surely someone else who has used Table Valued UDFs has come accross this problem. I would appreciate some feedback from someone in the know, as to whether I'm doing something wrong in my code, or how to optimize an SQL Server properly to allow for better performance with CLR functions.
Thanks,
Dragan Radovic
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Dec 11, 2007
Hi all,
I copied the following code from Microsoft SQL Server 2005 Online (September 2007):
UDF_table.sql:
USE AdventureWorks;
GO
IF OBJECT_ID(N'dbo.ufnGetContactInformation', N'TF') IS NOT NULL
DROP FUNCTION dbo.ufnGetContactInformation;
GO
CREATE FUNCTION dbo.ufnGetContactInformation(@ContactID int)
RETURNS @retContactInformation TABLE
(
-- Columns returned by the function
ContactID int PRIMARY KEY NOT NULL,
FirstName nvarchar(50) NULL,
LastName nvarchar(50) NULL,
JobTitle nvarchar(50) NULL,
ContactType nvarchar(50) NULL
)
AS
-- Returns the first name, last name, job title, and contact type for the specified contact.
BEGIN
DECLARE
@FirstName nvarchar(50),
@LastName nvarchar(50),
@JobTitle nvarchar(50),
@ContactType nvarchar(50);
-- Get common contact information
SELECT
@ContactID = ContactID,
@FirstName = FirstName,
@LastName = LastName
FROM Person.Contact
WHERE ContactID = @ContactID;
SELECT @JobTitle =
CASE
-- Check for employee
WHEN EXISTS(SELECT * FROM HumanResources.Employee e
WHERE e.ContactID = @ContactID)
THEN (SELECT Title
FROM HumanResources.Employee
WHERE ContactID = @ContactID)
-- Check for vendor
WHEN EXISTS(SELECT * FROM Purchasing.VendorContact vc
INNER JOIN Person.ContactType ct
ON vc.ContactTypeID = ct.ContactTypeID
WHERE vc.ContactID = @ContactID)
THEN (SELECT ct.Name
FROM Purchasing.VendorContact vc
INNER JOIN Person.ContactType ct
ON vc.ContactTypeID = ct.ContactTypeID
WHERE vc.ContactID = @ContactID)
-- Check for store
WHEN EXISTS(SELECT * FROM Sales.StoreContact sc
INNER JOIN Person.ContactType ct
ON sc.ContactTypeID = ct.ContactTypeID
WHERE sc.ContactID = @ContactID)
THEN (SELECT ct.Name
FROM Sales.StoreContact sc
INNER JOIN Person.ContactType ct
ON sc.ContactTypeID = ct.ContactTypeID
WHERE ContactID = @ContactID)
ELSE NULL
END;
SET @ContactType =
CASE
-- Check for employee
WHEN EXISTS(SELECT * FROM HumanResources.Employee e
WHERE e.ContactID = @ContactID)
THEN 'Employee'
-- Check for vendor
WHEN EXISTS(SELECT * FROM Purchasing.VendorContact vc
INNER JOIN Person.ContactType ct
ON vc.ContactTypeID = ct.ContactTypeID
WHERE vc.ContactID = @ContactID)
THEN 'Vendor Contact'
-- Check for store
WHEN EXISTS(SELECT * FROM Sales.StoreContact sc
INNER JOIN Person.ContactType ct
ON sc.ContactTypeID = ct.ContactTypeID
WHERE sc.ContactID = @ContactID)
THEN 'Store Contact'
-- Check for individual consumer
WHEN EXISTS(SELECT * FROM Sales.Individual i
WHERE i.ContactID = @ContactID)
THEN 'Consumer'
END;
-- Return the information to the caller
IF @ContactID IS NOT NULL
BEGIN
INSERT @retContactInformation
SELECT @ContactID, @FirstName, @LastName, @JobTitle, @ContactType;
END;
RETURN;
END;
GO
----------------------------------------------------------------------
I executed it in my SQL Server Management Studio Express and I got: Commands completed successfully. I do not know where the result is and how to get the result viewed. Please help and advise.
Thanks in advance,
Scott Chang
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Sep 14, 2007
i have a table in which there is a column of type varchar(20), containing a non-standard datetime string, so i wrote a user-defined function to convert this string to datetime value to do further work. the function first reformat the string so that sql server can recognize it and then use cast() function convert the reformatted string to datetime type.
at begining it works fine, but now i found that there might be some corrupted data in this daily-updated table, whos date string is unconvertable. so when i'm trying to process some date containing corrupted records, the string-to-datetime function breaks, reporting it has meet an converting error. i searched msdn and found that the tsql try..catch statement can't be used in user defined function. now i have no idea on how to solve this problem, is there anyone can help me? or is there any way to pick those corrupted rows out so i can throw them away? thanks
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Feb 1, 2006
Ok, I'm pretty knowledgable about T-SQL, but I've hit something that seems should work, but just doesn't...
I'm writing a stored procedure that needs to use the primary key fields of a table that is being passed to me so that I can generate what will most likely be a dynamically generated SQL statement and then execute it.
So the first thing I do, is I need to grab the primary key fields of the table. I'd rather not go down to the base system tables since we may (hopefully) upgrade this one SQL 2000 machine to 2005 fairly soon, so I poke around, and find sp_pkeys in the master table. Great. I pass in the table name, and sure enough, it comes back with a record set, 1 row per column. That's exactly what I need.
Umm... This is the part where I'm at a loss. The stored procedure outputs the resultset as a resultset (Not as an output param). Now I want to use that list in my stored procedure, thinking that if the base tables change, Microsoft will change the stored procedure accordingly, so even after a version upgrade my stuff SHOULD still work. But... How do I use the resultset from the stored procedure? You can't reference it like a table-valued function, nor can you 'capture' the resultset for use using the syntax like:
DECLARE @table table@table=EXEC sp_pkeys MyTable
That of course just returns you the RETURN_VALUE instead of the resultset it output. Ugh. Ok, so I finally decide to just bite the bullet, and I grab the code from sp_pkeys and make my own little function called fn_pkeys. Since I might also want to be able to 'force' the primary keys (Maybe the table doesn't really have one, but logically it does), I decide it'll pass back a comma-delimited varchar of columns that make up the primary key. Ok, I test it and it works great.
Now, I'm happily going along and building my routine, and realize, hey, I don't really want that in a comma-delimited varchar, I want to use it in one of my queries, and I have this nice little table-valued function I call split, that takes a comma-delimited varchar, and returns a table... So I preceed to try it out...
SELECT *FROM Split(fn_pkeys('MyTable'),DEFAULT)
Syntax Error. Ugh. Eventually, I even try:
SELECT *FROM Split(substring('abc,def',2,6),DEFAULT)
Syntax Error.
Hmm...What am I doing wrong here, or can't you use a scalar-valued function as a parameter into a table-valued function?
SELECT *FROM Split('bc,def',DEFAULT) works just fine.
So my questions are:
Is there any way to programmatically capture a resultset that is being output from a stored procedure for use in the stored procedure that called it?
Is there any way to pass a scalar-valued function as a parameter into a table-valued function?
Oh, this works as well as a work around, but I'm more interested in if there is a way without having to workaround:
DECLARE @tmp varchar(8000)
SET @tmp=(SELECT dbo.fn_pkeys('MyTable'))
SELECT *
FROM Split(@tmp,DEFAULT)
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Jul 20, 2005
Does anyone know where to find or how to write a quick user defined fucntionthat will return a table object when passed the string name of the tableobject. The reason why I want dynamicallly set the table name in a storedprocudue WITHOUT using concatination and exec a SQL String.HenceIf @small_int_parameter_previous = 1 then@vchar_tablename = "sales_previous"else@vchar_tablename = "sales"Endselect * from udf_TableLookup(@vchar_tablename )So if I pass 1, that means I want all records from "sales_previous"otherwise give me all records from "sales" (Sales_Previous would last yearssales data for example).udf_TableLookup would I guess lookup in sysobjects for the table name andreturn the table object? I don't know how to do this.I want to do this to avoid having 2 stored procedures..one for current andone for previous year.Please respond to group so others may benfiit from you knowledge.ThanksErik
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Aug 9, 2014
I'm trying to create a simple function that will do a count on a table. I want to pass the table name in form of a parameter to the variable and this function will return the count as an int. See my function below...
CREATE FUNCTION count_rows (@tablename varchar(100)
RETURNS int AS
BEGIN
DECLARE @emp_count AS int
declare @declaration varchar(100)
[Code] ....
The errors I am getting are as follows:
Msg 102, Level 15, State 1, Procedure count_rows, Line 3
Incorrect syntax near 'RETURNS'.
Msg 102, Level 15, State 1, Procedure count_rows, Line 10
Incorrect syntax near '@declaration'.
Msg 178, Level 15, State 1, Procedure count_rows, Line 14
A RETURN statement with a return value cannot be used in this context.
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Aug 1, 2005
I have this function in access I need to be able to use in ms sql. Having problems trying to get it to work. The function gets rid of the leading zeros if the field being past dosn't have any non number characters.For example:TrimZero("000000001023") > "1023"TrimZero("E1025") > "E1025"TrimZero("000000021021") > "21021"TrimZero("R5545") > "R5545"Here is the function that works in access:Public Function TrimZero(strField As Variant) As String Dim strReturn As String If IsNull(strField) = True Then strReturn = "" Else strReturn = strField Do While Left(strReturn, 1) = "0" strReturn = Mid(strReturn, 2) Loop End If TrimZero = strReturnEnd Function
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Dec 9, 2007
Hi all,
I executed the following sql script successfuuly:
shcInLineTableFN.sql:
USE pubs
GO
CREATE FUNCTION dbo.AuthorsForState(@cState char(2))
RETURNS TABLE
AS
RETURN (SELECT * FROM Authors WHERE state = @cState)
GO
And the "dbo.AuthorsForState" is in the Table-valued Functions, Programmabilty, pubs Database.
I tried to get the result out of the "dbo.AuthorsForState" by executing the following sql script:
shcInlineTableFNresult.sql:
USE pubs
GO
SELECT * FROM shcInLineTableFN
GO
I got the following error message:
Msg 208, Level 16, State 1, Line 1
Invalid object name 'shcInLineTableFN'.
Please help and advise me how to fix the syntax
"SELECT * FROM shcInLineTableFN"
and get the right table shown in the output.
Thanks in advance,
Scott Chang
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Mar 22, 2006
Got some errors on this one...
Is Rand function cannot be used in the User Defined function?
Thanks.
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Jan 10, 2007
I have a UDF that takes my input and returns the next valid business day date. My valid date excludes weekends and holidays.
It works perfect except for one issue. It doesn't check to see if today's date is a holiday.
I pass a query to sql server like so " select dbo.getstartdate('01/ 10/2007',2)"
It then moves ahead two business days and returns that date.
Here is the current code. Hopefully someone can tell me how to do the holiday check on the current date.
I really don't want to rewrite the whole script .
Code---------------------------------------------------------
SET QUOTED_IDENTIFIER OFF GOSET ANSI_NULLS OFF GO
--DROP FUNCTION GetStartDate
--declare function receiving two parameters ---the date we start counting and the number of business days
CREATE FUNCTION GetStartDate (@startdate datetime, @days int) RETURNS datetimeASBEGIN
--declare a counter to keep track of how many days are passingdeclare @counter int
/*Check your business rules. If 4 business days means you count starting tomorrow, set counter to 0. If you start counting today, set counter to 1*/set @counter = 1
--declare a variable to hold the ending datedeclare @enddate datetime
--set the end date to the start date. we'll be -- incrementing it for each passing business dayset @enddate = @startdate
/*Start your loop.While your counter (which was set to 1), is less than or equal to the number of business days increment your end date*/WHILE @counter <= @days
BEGIN
--for each day, we'll add one to the end dateset @enddate = DATEADD(dd, 1, @enddate)
--If the day is between 2 and 6 (meaning it's a week --day and the day is not in the holiday table, we'll --increment the counter IF (DATEPART(dw, @enddate) between 2 and 6) AND (@enddate not in ( select HolidayDate from tFederalHoliday where [HolidayYear] = datepart(yyyy,@enddate) ) ) BEGIN set @counter = @counter + 1 END
--end the while loopEND
--return the end dateRETURN @enddate
--end the functionEND
GOSET QUOTED_IDENTIFIER OFF GOSET ANSI_NULLS ON GO
---------------------------------------------------------------------------------------------
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Aug 17, 2005
Hi everyone,
I am tring to pass acomma delimited string to a function and this function is parsing the string so that I can see individual values so for example I am passing 1,2,3,4,5 as a parameter to my function and I am parsing this string so that I can write something like this
Select * from tableA where userID in(1,2,3,4)
It is working fine. Only problem is if the user passes word 'all' instead of 1,2,3,4 then I have to doSelect * from tableA
My function looks like this. How can I modify this function if I pass 'all' as a paramater. Any help will be appreciated.CREATE FUNCTION [dbo].[ParseText2File] (@p_text varchar(4000), @p_Delimeter char(1))
RETURNS @results TABLE (id varchar(100))
AS
BEGIN
declare @i1 varchar(200)
declare @i2 varchar(200)
declare @tempResults Table (id varchar(100))
while len(@p_text) > 0 and charindex
(@p_Delimeter, @p_text) <> 0
begin
select @i1 = left(@p_text, charindex(@p_Delimeter, @p_text) - 1)
insert @tempResults select @i1
select @p_text = right(@p_text, len(@p_text) - charindex(@p_Delimeter,@p_text))
end
insert @tempResults select @p_text
insert @results
select *
from @tempResults
return
END
Thanks
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Dec 14, 1999
How can I create a user defined function in SQL and call it inline from a SQL statement? I need the ability to execute a statement such as:
select myFunc(x,y) from table
I need myFunc(x,y) to return a value, not a recordset and use that value in the select statement. Any and all ideas would be appreciated.
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Aug 2, 1999
Dear friends,
I am a new user for SQL server. Coming from an oracle background, I find it very difficult to live without user defined functions. At the moment, I urgently need to have a function returning an custom-made ID string, so that it can be used in one of my stored procedures. I have heard the rumours that SQL server 7 does NOT support user defined functions, (which SQL 6.5 does). I would be really grateful if anyone can clarify this for me, and if possible, suggest a get-around approach.
Thanks in advance!
Kai
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Jun 23, 2004
I am trying to compare the data from one table (shipments) with the data from a view. The point of the function is to match the correct territory with the account depending on the data. Basically, I this deals with accounts that are transfering from one territory to another. The transfers take effect on the first day of the month, retroactive, therefore we need to allocate the sales data to the correct territory in the shipments table. Here is my function. Can someone tell me how I can get this to work and insert a territory ID for the account that has transfered into the shipments table?
CREATE FUNCTION fnShipments ()
RETURNS @Shipments TABLE (AccountID CHAR(10), DateInvoice DateTime, DollarShipments Money, TerritoryID CHAR(10))
AS
BEGIN
INSERT @Shipments (AccountID, DateInvoice, DollarShipments, TerritoryID)
SELECT Shipments.AccountID, Shipments.DateInvoice, DollarShipments, ISNULL((SELECT TerritoryID FROM vwAccountTransfers
WHERE Shipments.AccountID = vwAccountTransfers.AccountID
AND vwAccountTransfers.EffectiveMonth =
(SELECT MIN(EffectiveMonth)
FROM vwAccountTransfers
WHERE Shipments.AccountID = vwAccountTransfers.AccountID
AND DatePart(m,Shipments.DateInvoice) < vwAccountTransfers.EffectiveMonth)),
(SELECT TerritoryID FROM vwAccountTransfers
WHERE Shipments.AccountID = vwAccountTransfers.AccountID
AND vwAccountTransfers.EffectiveMonth Is Null )
) AS Territory
FROM Shipments
ORDER BY Shipments.AccountID, Shipments.DateInvoice;
RETURN
END
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Nov 10, 2004
I need a UDF that will do the following:
User: Will be sending me a datetime e.g '9 Nov 2004 15:00:00'
I want the UDF to do the following for me
Return in hours the difference between what the user has send and now (lets say now = '10 Nov 2004 11:00:00')
So the UDF will return to me 20.
But I dont want 20, I want the UDF to avoid any all hours which are not work related (any time after 16h00
until 8h00 in the morning), so I want this UDF to return 4. That means from '9 Nov 2004 15:00:00' I have calculated
1hr until 16h00 and 3hrs from 8 until 11h00 on '10 Nov 2004 11:00:00'
AGAIN IT MUST NOT CALCULATE WEEKENDS. Lets say '12 Nov 2004 15:00:00' was Friday and now = '15 Nov 2004 11:00:00', I must still
get 4 as a return from UDF
I would also like now to be my getdate(), but it seems like you can't use it in UDF
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Mar 20, 2004
I create the following UDF just for learning purposes and I cannot seem to get it to return a value.
Stored Procedure
REATE PROCEDURE usp_GetXSection
@fWidth float,
@fHeight float,
@fResult float OUTPUT
AS
BEGIN
set @fResult = [dbo].[XSECTION](@fWidth, @fHeight)
END
GO
Ane the following UDF
CREATE FUNCTION XSECTION
(@Width float, @Height float)
RETURNS float
AS
BEGIN
RETURN (@Width * @Height)
END
I call it using ADO in a c++ application, but all returns empty
Any ideas? C++ code to follow.
Mike B
void CFormTemplateSetup::OnCalculate()
{
_CommandPtr pCmd(__uuidof(Command));
_ParameterPtr pWidth(__uuidof(Parameter));
_ParameterPtr pHeight(__uuidof(Parameter));
_ParameterPtr pResult(__uuidof(Parameter));
try
{
pCmd->ActiveConnection = GetDocument()->GetConnection();
pCmd->CommandText = _T("usp_GetXSection");
pCmd->CommandType = adCmdStoredProc;
_variant_t vWidth, vHeight;
vWidth.vt = VT_R4;
vHeight.vt = VT_R4;
vWidth.fltVal = 10;
vHeight.fltVal = 10;
pWidth = pCmd->CreateParameter(_T("@fWidth"), adInteger, adParamInput, sizeof(int), vWidth);
pHeight = pCmd->CreateParameter(_T("@fHeight"), adInteger, adParamInput, sizeof(int), vHeight);
pResult = pCmd->CreateParameter(_T("@fResult"), adDouble, adParamOutput, sizeof(float), vtMissing);
pCmd->Parameters->Append(pWidth);
pCmd->Parameters->Append(pHeight);
pCmd->Parameters->Append(pResult);
_variant_t vResult = pResult->Value;
float fArea = pResult->Value.fltVal;
CString csArea;
csArea.Format("Area = %d", fArea);
::AfxMessageBox(csArea);
}
catch(_com_error& e)
{
::AfxMessageBox(e.Description());
}
}
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Apr 17, 2007
Hi,
Iam working on one user defined function which will take week & year as argument and returns sunday date of that particular week in that year. for example if i give (15,2007) as argument it shud give 2007-04-08 as result. Plz anybody help this on this issue.
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Apr 6, 2006
I am accustomed to doing most of my function work in Access, but the boss would really like it if I could shedule some cubes to do the stuff that takes forever when you run it live.
To that end, I have an Access function that I call to get a field value for a query. I would like to be able to create an User Defined Function on the SQL server and call that function as a field value in a view. I have searched the forums and have not really found anything that wants to make sense to me as to how to do this.
The access function is as follows:
Public Function BuyerDeltas(IFSDate As Date, PODate As Date) As Long
If IFSDate < (Date + 14) Then
BuyerDeltas = IFSDate - 3 - PODate
ElseIf IFSDate < (Date + 29) Then
BuyerDeltas = IFSDate - 7 - PODate
ElseIf IFSDate > (Date + 28) Then
BuyerDeltas = IFSDate - 10 - PODate
Else
MsgBox "This should not be possible!", vbOKOnly, "Fix It!!!!!!!"
End If
End Function
The view that this is called from contains the IFSDate and PODate fields and I am able to call the function from the access query, but this is completely different than what I have seen in the help files on SQL.
I would love to be able to keep plugging away at doing this myself, but the boss also is pushing me to get it done and he doesn't want me taking forever to do it.
Any direction would be greatly appreciated!
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Aug 28, 2007
hai,
the problem is - I have created a userdefined function using SQL 2000
create function getfulldate (@date varchar(10))returns datetimeasbegindeclare @getfulldate datetime set @getfulldate = dateadd (mi,55,@date)
return @getfulldateend
and normally we call this in the SQL statements as
select *, dbo.getfulldate('2006-05-03') from emp
This works fine and what I need was, I need to invoke the user-defined function like
select *, getfulldate('2006-05-03') from emp that is, without using "dbo".
If I call in that manner, it gives error as - 'getfulldate' is not a recognized function name.
So, here what is the purpose of dbo and can I call in my desired manner as mentioned above.
anyone guide me, thanks!
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Aug 4, 2005
Hi,How to exec a SQL user defined function in query analyzer when it accepts parameters.. I know for a stored procedure we can write EXEC nameofstored procedure abc (@abc is the parameter passed).. But How to run a SQL function ?Thanks
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Feb 28, 2006
I have a sproc that passes an ID to a user defined function. I just realized that the udf can only return scalar type value. I need it to return a varchar(10). How can i do this with similiar functionality. Any ideas?
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Jun 9, 2004
Hi,
I have a requirement where i need to get the current time/date within a Function. As getDate function is a non deterministic function it can not be used with in a function. Your guidence in this regard is greately appreciated.
Regards,
Samcute.
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Aug 13, 2004
Hi,
It is possible to use getdate() in userdefined function. If so, how to do the same ?
The following code throws error :
create function function1
return varchar
DECLARE @currYYMM VARCHAR(20)
SET @currYYMM = convert(char(4),getdate(),12)
// Here it says the error 'getdate' can't be used inside functions
...............
.....................
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Nov 1, 2006
Hi,
While i execute the followgin code. it gives error. Please resolve it as while calling the function i want to use getdate() or any other dynamic variable or any select such as
select title from SalesByStore( select admission_Dte from addmission )
It gives error.
--------------------------------------------------------------------------
use pubs
go
createFUNCTION SalesByStore (@storeid datetime)
RETURNS TABLE
AS
RETURN (SELECT top 5 title, qty
FROM sales s, titles t
)
go
select title from SalesByStore(getdate())
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Mar 3, 2004
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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Jul 12, 2002
Dave writes "Anybody knows of a good resource for "generic" SQL Server User Defined Functions ?"
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Jul 23, 2005
This is driving me crazy.I need to create a UDF that would return a TRUE/FALSE (bit) value basedon a comparison it does.CREATE FUNCTION dbo.SelectedByApplication(@ApplicationID int,@TableToChecknvarchar(50),@ColumnToComparenvarchar(50),@ValueInTableint)RETURNS BIT ASBEGINDECLARE @SQLNVARCHAR(1000)DECLARE @Param NVARCHAR(500)DECLARE @Result intSET @SQL = N'SELECT @result = COUNT(*) FROM [' + @TableToCheck + '] '+'WHERE [' + @ColumnToCompare + '] = @ValueInTable ANDApplicationID = @ApplicationID'SET @Param = N'@result int out, @ValueInTable int, @ApplicationIDint'EXECUTE sp_executesql @SQL, @Param, @result out, @ValueInTable,@ApplicationIDif @result > 0return 1return 0ENDAll I need the function to do is fill in a column based on whetherthere is a relation between a list of data and the item. I'm trying touse it in the following query:SELECT *, EXEC dbo.SelectedByApplication(4, 'IPM_Application_DataType','DataTypeID', DataTypeID)FROM IPM_DataType DTThe idea is to make this call and then be able to populate a list ofcheckboxes based on the information it returns. It should returnsomething similiar to:Column1 Column2 UDFColumn1 SomeValue 02 OtherValue 13 DifferentValue 04 LastValue 1After reading some of the posts and discovering you can't executedynamic SQL in a UDF I decided to split the function into a functionand stored procedure:CREATE FUNCTION dbo.SelectedByApplication(@ApplicationID int,@TableToChecknvarchar(50),@ColumnToComparenvarchar(50),@ValueInTableint)RETURNS BIT ASBEGINDeclare @Result INTEXEC DynamicCompare @ApplicationID, @TableToCheck, @ColumnToCompare,@ValueInTable, @Resultif(@Result > 0)return 1return 0ENDCREATE PROCEDURE dbo.DynamicCompare(@ApplicationID int,@TableToChecknvarchar(50),@ColumnToComparenvarchar(50),@ValueInTableint,@Resultint out)ASDECLARE @SQLNVARCHAR(1000)DECLARE @Param NVARCHAR(500)SET @SQL = N'SELECT @result = COUNT(*) FROM [' + @TableToCheck + ']' +'WHERE [' + @ColumnToCompare + '] = @ValueInTable ANDApplicationID = @ApplicationID'SET @Param = N'@result int out, @ValueInTable int, @ApplicationIDint'EXECUTE sp_executesql @SQL, @Param, @result out, @ValueInTable,@ApplicationIDI get the same error message about only being able to execute functionsand extended stored procedures in a user defined function.Does anyone have any ideas as to how I can dynamically execute thisquery? The reason I say dynamic is I need this same comparison forabout 25 different tables. Thanks!
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Jul 20, 2005
Is it possible to call a user-defined function without prefixing itwith 'dbo.' within a SELECT clause somehow? Just curious; it's not abig issue but just a stylistic one for me.Thanks!Joel Thornton ~ <groups@joelpt.eml.cc>
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Jul 20, 2005
I have a user defined function that may be called multiple times inthe same query - here's a rough exampleselect col1, get_random_number(), col2, col3, get_random_number() fromtable1The problem I am having is that I need to have both calls to the userdefined function return the same value if it is called multiple timesfor one row. The values returned from the query would be somethig likethis -John 23456 Engineer Junior 23456Frank 33333 Engineer Senior 33333Tom 80331 Engineer Junior 80331I have thought about having two seperate udf's likeget_random_number() and use_last_random_number(), but I'm not sure howto store the value of the get_random_number() to be used byuse_last_random_number(). These udfs are used in bulk load requests,so performance is a big issue. Any suggestions would be greatlyappreciated. I know the example is kind of silly, but I think itillustrates the problem.
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Jun 1, 2006
Hi,
How can I do dynamical exec to query in user-defined function? At the end I need to return the result.
Thank's
Alexei
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May 21, 2006
I have a user defined function (UDF) that takes 2 parameters. These parameters will be mapped from OLE DB source column values. I want the function result to be a new column that will be mapped to an OLE DB destination. Should this be done using a lookup task, OLE DB command task, or...? If this is possible I would appreciate a very specific example of how it's done.
BTW I tried using a lookup task with a SQL command before the UDF idea occurred to me and ran into problems using parameters in the SQL query:
Parameter Information cannot be derived from SQL statments. Set parameter information before preparing command.
I've seen the posts about going to the advanced tab and messing with the parameters there but I was hoping using a UDF would be easier, if it can be done.
Thanks.
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Dec 7, 2007
Hi,
I'm trying to write an aggregat in c#.It's no problem for sum or multiplication aggregates.
But when I try to use an array to stor the values in it, to compare them with each other,
I get the Message:
Fehler 1 Type "AggregatClr.AggregatClr" is marked for native serialization, but field "Werte" of type "AggregatClr.AggregatClr" is of type "mscorlib.System.Array" which is a non-value type. Native serialization types can only have fields of blittable types. If you wish to have a field of any other type, consider using different kind of serialization format, such as User Defined Serialization. AggregatClr
And when I try it with User Defined instead of Native:
Fehler 1 Type "AggregatClr.AggregatClr" is marked for user-defined serialization, but does not implement the "System.Data.Microsoft.SqlServer.Server.IBinarySerialize" interface. AggregatClr
What does that means? How can I do that??
Is it possible to use an Array in a User Defined Aggregat??
Thanks
Pam
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May 3, 2006
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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