Functions In Functions

Sep 24, 2007


I have to calculate data in function with "EXEC". During runtime I get the Error:

"Only functions and extended stored procedures can be executed from within a function."

I would use a Stored Procedure, but the function is to be called from a view. I don't understand, why that should not be possible. Is there any way to shut that message down or to work around?
btw: Storing all the data in a table, would mean a lot of work, I rather not like to do. ;-)

Thx for any help

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SQL Server 2005: CLR Functions Vs SQL Functions

May 26, 2006

I was playing around with the new SQL 2005 CLR functionality andremembered this discussion that I had with Erland Sommarskog concerningperformance of scalar UDFs some time ago (See "Calling sp_oa* infunction" in this newsgroup). In that discussion, Erland made thefollowing comment about UDFs in SQL 2005:[color=blue][color=green]>>The good news is that in SQL 2005, Microsoft has addressed several of[/color][/color]these issues, and the cost of a UDF is not as severe there. In fact fora complex expression, a UDF in written a CLR language may be fasterthanthe corresponding expression using built-in T-SQL functions.<<I thought the I would put this to the test using some of the same SQLas before, but adding a simple scalar CLR UDF into the mix. The testinvolved querying a simple table with about 300,000 rows. Thescenarios are as follows:(A) Use a simple CASE function to calculate a column(B) Use a simple CASE function to calculate a column and as a criterionin the WHERE clause(C) Use a scalar UDF to calculate a column(D) Use a scalar UDF to calculate a column and as a criterion in theWHERE clause(E) Use a scalar CLR UDF to calculate a column(F) Use a scalar CLR UDF to calculate a column and as a criterion inthe WHERE clauseA sample of the results is as follows (time in milliseconds):(295310 row(s) affected)A: 1563(150003 row(s) affected)B: 906(295310 row(s) affected)C: 2703(150003 row(s) affected)D: 2533(295310 row(s) affected)E: 2060(150003 row(s) affected)F: 2190The scalar CLR UDF function was significantly faster than the classicscalar UDF, even for this very simple function. Perhaps a more complexfunction would have shown even a greater difference. Based on this, Imust conclude that Erland was right. Of course, it's still faster tostick with basic built-in functions like CASE.In another test, I decided to run some queries to compare built-inaggregates vs. a couple of simple CLR aggregates as follows:(G) Calculate averages by group using the built-in AVG aggregate(H) Calculate averages by group using a CLR aggregate that similatesthe built-in AVG aggregate(I) Calculate a "trimmed" average by group (average excluding highestand lowest values) using built-in aggregates(J) Calculate a "trimmed" average by group using a CLR aggregatespecially designed for this purposeA sample of the results is as follows (time in milliseconds):(59 row(s) affected)G: 313(59 row(s) affected)H: 890(59 row(s) affected)I: 216(59 row(s) affected)J: 846It seems that the CLR aggregates came with a significant performancepenalty over the built-in aggregates. Perhaps they would pay off if Iwere attempting a very complex type of aggregation. However, at thispoint I'm going to shy away from using these unless I can't find a wayto do the calculation with standard SQL.In a way, I'm happy that basic SQL still seems to be the fastest way toget things done. With the addition of the new CLR functionality, Isuspect that MS may be giving us developers enough rope to comfortablyhang ourselves if we're not careful.Bill E.Hollywood, FL------------------------------------------------------------------------- table TestAssignment, about 300,000 rowsCREATE TABLE [dbo].[TestAssignment]([TestAssignmentID] [int] NOT NULL,[ProductID] [int] NULL,[PercentPassed] [int] NULL,CONSTRAINT [PK_TestAssignment] PRIMARY KEY CLUSTERED([TestAssignmentID] ASC)--Scalar UDF in SQLCREATE FUNCTION [dbo].[fnIsEven](@intValue int)RETURNS bitASBEGINDeclare @bitReturnValue bitIf @intValue % 2 = 0Set @bitReturnValue=1ElseSet @bitReturnValue=0RETURN @bitReturnValueEND--Scalar CLR UDF/*using System;using System.Data;using System.Data.SqlClient;using System.Data.SqlTypes;using Microsoft.SqlServer.Server;public partial class UserDefinedFunctions{[Microsoft.SqlServer.Server.SqlFunction(IsDetermini stic=true,IsPrecise=true)]public static SqlBoolean IsEven(SqlInt32 value){if(value % 2 == 0){return true;}else{return false;}}};*/--Test #1--Scenario A - Query with calculated column--SELECT TestAssignmentID,CASE WHEN TestAssignmentID % 2=0 THEN 1 ELSE 0 END ASCalcColumnFROM TestAssignment--Scenario B - Query with calculated column as criterion--SELECT TestAssignmentID,CASE WHEN TestAssignmentID % 2=0 THEN 1 ELSE 0 END ASCalcColumnFROM TestAssignmentWHERE CASE WHEN TestAssignmentID % 2=0 THEN 1 ELSE 0 END=1--Scenario C - Query using scalar UDF--SELECT TestAssignmentID,dbo.fnIsEven(TestAssignmentID) AS CalcColumnFROM TestAssignment--Scenario D - Query using scalar UDF as crierion--SELECT TestAssignmentID,dbo.fnIsEven(TestAssignmentID) AS CalcColumnFROM TestAssignmentWHERE dbo.fnIsEven(TestAssignmentID)=1--Scenario E - Query using CLR scalar UDF--SELECT TestAssignmentID,dbo.fnIsEven_CLR(TestAssignmentID) AS CalcColumnFROM TestAssignment--Scenario F - Query using CLR scalar UDF as crierion--SELECT TestAssignmentID,dbo.fnIsEven_CLR(TestAssignmentID) AS CalcColumnFROM TestAssignmentWHERE dbo.fnIsEven(TestAssignmentID)=1--CLR Aggregate functions/*using System;using System.Data;using System.Data.SqlClient;using System.Data.SqlTypes;using Microsoft.SqlServer.Server;[Serializable][Microsoft.SqlServer.Server.SqlUserDefinedAggregate (Format.Native)]public struct Avg{public void Init(){this.numValues = 0;this.totalValue = 0;}public void Accumulate(SqlDouble Value){if (!Value.IsNull){this.numValues++;this.totalValue += Value;}}public void Merge(Avg Group){if (Group.numValues > 0){this.numValues += Group.numValues;this.totalValue += Group.totalValue;}}public SqlDouble Terminate(){if (numValues == 0){return SqlDouble.Null;}else{return (this.totalValue / this.numValues);}}// private accumulatorsprivate int numValues;private SqlDouble totalValue;}[Serializable][Microsoft.SqlServer.Server.SqlUserDefinedAggregate (Format.Native)]public struct TrimmedAvg{public void Init(){this.numValues = 0;this.totalValue = 0;this.minValue = SqlDouble.MaxValue;this.maxValue = SqlDouble.MinValue;}public void Accumulate(SqlDouble Value){if (!Value.IsNull){this.numValues++;this.totalValue += Value;if (Value < this.minValue)this.minValue = Value;if (Value > this.maxValue)this.maxValue = Value;}}public void Merge(TrimmedAvg Group){if (Group.numValues > 0){this.numValues += Group.numValues;this.totalValue += Group.totalValue;if (Group.minValue < this.minValue)this.minValue = Group.minValue;if (Group.maxValue > this.maxValue)this.maxValue = Group.maxValue;}}public SqlDouble Terminate(){if (this.numValues < 3)return SqlDouble.Null;else{this.numValues -= 2;this.totalValue -= this.minValue;this.totalValue -= this.maxValue;return (this.totalValue / this.numValues);}}// private accumulatorsprivate int numValues;private SqlDouble totalValue;private SqlDouble minValue;private SqlDouble maxValue;}*/--Test #2--Scenario G - Average Query using built-in aggregate--SELECT ProductID, Avg(Cast(PercentPassed AS float))FROM TestAssignmentGROUP BY ProductIDORDER BY ProductID--Scenario H - Average Query using CLR aggregate--SELECT ProductID, dbo.Avg_CLR(Cast(PercentPassed AS float)) AS AverageFROM TestAssignmentGROUP BY ProductIDORDER BY ProductID--Scenario I - Trimmed Average Query using built in aggregates/setoperations--SELECT A.ProductID,CaseWhen B.CountValues<3 Then NullElse Cast(A.Total-B.MaxValue-B.MinValue ASfloat)/Cast(B.CountValues-2 As float)End AS AverageFROM(SELECT ProductID, Sum(PercentPassed) AS TotalFROM TestAssignmentGROUP BY ProductID) ALEFT JOIN(SELECT ProductID,Max(PercentPassed) AS MaxValue,Min(PercentPassed) AS MinValue,Count(*) AS CountValuesFROM TestAssignmentWHERE PercentPassed Is Not NullGROUP BY ProductID) BON A.ProductID=B.ProductIDORDER BY A.ProductID--Scenario J - Trimmed Average Query using CLR aggregate--SELECT ProductID, dbo.TrimmedAvg_CLR(Cast(PercentPassed AS real)) ASAverageFROM TestAssignmentGROUP BY ProductIDORDER BY ProductID

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Feb 22, 2007

Guys I need help with sql server 2005 syntax
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How do I then use a stored proceedure to return a table of the values for use on my site?

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Mar 25, 2006

WIthin SQL Server 2005, there are functions.  This feature is new to me and I haven't found anyone that has written their own fucntions?  I'm wondering if functions are written the same as stored procedures, and can a function be called from a stored procedure or even from within a query.

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Mar 12, 2007

hello Im having a difficult time translating this query from Access to SQL because it uses the First/Last functions.

I have a 'Projects' Table and a 'Project_Comments' table, each has a 'Project_ID' field which links the 2 together. What I need to do is retrieve a Project List from the Projects Table and also the first Comment of each project based on the Commend_date field in the Project_Comments table. This is the MS ACCESS query:

SELECT Projects.Project_Number, Projects.Project_Name, First(Project Comments.Comment_Date), First(Project_Comments.Notes)
FROM Projects Left Join Projec_Comments ON
Projects.Project_Number = Project_Comments.Project_Number
GROUP BY Projects.Project_Number, Projects.Project_Name

Now I can use Min() for the Date instead of First, however I dont know what to do with the Notes field. Any help on how to get this over to sql would be greatly appreciated!

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Jun 3, 2008


I have created a function that returns a comma seperated list of product id's from a table. I need to call this function from a stored procedure to help filter my product results, something like the following:

SET @SQL = 'SELECT dbo.Products.ProductID FROM dbo.Products WHERE dbo.Products.ProductID IN (' + dbo.GetModels('dbo.Products.ProductID', '') + '))'

The problem I am having when executing the above is:

"Conversion failed when converting the varchar value 'dbo.Products.ProductID' to data type int."

Can anyone shed some light on how I can call the function, feeding through the product ID from the row of the select statement I am trying to execute (if this makes sense).

Any help would be great.


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Aug 25, 2005

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Aug 12, 2005

Hello,how I can use a function of my own within a select statement. I triedcreate function funny() returns intas beginreturn( 2 )end goand then "select funny()" but 'funny' is not a recognized function name.How can I solve this?thanks and regardsMark

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Jul 20, 2005

Hi,,I'm having a problem with calling a function from an activex scriptwithin a data transformation. the function takes 6 inputs and returnsa single output. My problem is that after trying all of the stuff onBOL I still can't get it to work. It's on the same database and I'mrunning sql 2000.when I try to call it I get an error message saying "object requiredfunctionname" If I put dbo in front of it I get "object required dbo".Can anyone shed any light on how i call this function and assign theoutput value returned to a variable name.thanks.

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Aug 10, 2007


I've created a function that performs modulo. I understand that SQL server 2000 / 2005 uses % for modulo, but we have an application that was written for Oracle. Oracle has a mod(dividend, divisor) function.

As to not rewite the queries, I would like to implement the function below:

the function executes properly but I must prefix it with the dbo schema.

Net: I can execute --- select dbo.mod(9,2) and it returns a 1 just like it should.

but I can not execute --- select mod(9,2) I receive the error "'mod' is not a recognized function name." on SQL 2000 and 2005.

If I can execute select mod(9,2) then I won't need to re-write any queries.

Also, on SQL 2005, I have tried to adjust the default shema, and the execute as clause, but neither helped my cause.

I'm going to try building the function in the CLR, but I think I will be faced with the same problem.

Can someone point me in the right direction?



create function mod
@dividend int,
@divisor int
declare @mod int
select @mod = @dividend % @divisor
return @mod

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Jun 14, 2007

I just installed SSRS 2005 and I have experience with SQL.

How come this function does not work?

FROM table1

I get a message which states that this command is not supported by the provider?

It works fine with other SQL tools like winsql?


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Oct 25, 2007

Can someone explain what the different SQL CE DLL's functions are? I can issue a successful merge replication and these seem to be the DLL's loaded just after it completes.

RSSWM.exe base address: 2C000000
sqlceoledb30.dll 00CB0000 35000 A
sqlceca30.dll 00CF0000 75000 A
sqlceqp30.dll 00D70000 DD000 A
sqlcese30.dll 00E50000 6A000 A
sqlceer30en.dll 00EC0000 24000 A
itcnetreg.dll 00EF0000 15000 A
itcswinsock.dll 00F10000 D000 A
itc50.dll 00F30000 27000 A
sqlceme30.dll 00F70000 10000 A
rsshelper.dll 00F80000 6000 A
tcpconnectiona.dll 00F90000 10000 A
edbgtl.dll 00FA0000 14000 A
itceventlog.dll 01110000 B000 A
rsaenh.dll 01350000 2B000 RO, H, S, C, RAM from ROM
iq_lapi_c_wrapper.dll 01B80000 27000 RO, XIP
ssapi.dll 01BB0000 17000 RO, XIP
mscoree2_0.dll 01D90000 C3000 RO, H, S, XIP

After some application activity, I attempt a merge replication again and it fails with a "DLL could not be loaded" yadda, yadda message. These seem to be the loaded DLL's at this point.

RSSWM.exe base address: 2C000000
sqlceqp30.dll 00D70000 DD000 A
sqlcese30.dll 00E50000 6A000 A
sqlceer30en.dll 00EC0000 24000 A
itcnetreg.dll 00EF0000 15000 A
itcswinsock.dll 00F10000 D000 A
itcadcdevmgmt.dll 00F20000 9000 A
itc50.dll 00F30000 27000 A
sqlceme30.dll 00F70000 10000 A
rsshelper.dll 00F80000 6000 A
tcpconnectiona.dll 00F90000 10000 A
edbgtl.dll 00FA0000 14000 A
itceventlog.dll 01110000 B000 A
rsaenh.dll 01350000 2B000 RO, H, S, C, RAM from ROM
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ssapi.dll 01BB0000 17000 RO, XIP
mscoree2_0.dll 01D90000 C3000 RO, H, S, XIP

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(App on an Intermec 751 with WM5 and 128MB RAM)

TIA for any help

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Oct 18, 2006

I usually access stored procedures using SQL data source. But now  I need a string returned from the database. If I write a function in SQL how do I access it from an aspx.vb file?

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Mar 25, 2008

 I hope this is a right form for ADO .net type of question. 
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May 5, 2008

Hi y'all I think i have some problem in here perhaps you guys can help.I have this code: 1 public void AddQstrWhere(ref string TmpStr,string Parameter)
2 {
3 if(TmpStr=="")
4 {
5 TmpStr +="WHERE"+Parameter;
6 }
7 else
8 {
9 TmpStr +="AND"+Parameter;
10 }
11 }
14 public string querySlsPerson;
15 //public string queryLastSls;
16 public ArrayList CLSGetSalesman(string szSalesmanID)
17 {
20 // TODO: Add CLSReportManager.CLSGetSalesman implementation
21 BOSTx Tex = GetTx(CLSReportConstants.TrnMasterID.FQN2,"QueryRptSales");
22 try
23 {
24 string querySalesPerson = "SELECT dbo.BOS_GL_Workplace.WpszState, BOS_PI_Employee_1.szName, dbo.BOS_PI_Employee.szName AS Expr1, dbo.BOS_PI_Employee.szEmployeeId, "+
25 " dbo.BOS_PI_Division.szName AS Divisi, dbo.BOS_PI_Team.szDescription "+
26 " FROM dbo.BOS_PI_Employee LEFT OUTER JOIN "+
27 " dbo.BOS_GL_Workplace ON dbo.BOS_PI_Employee.szWorkplaceId = dbo.BOS_GL_Workplace.szWorkplaceId LEFT OUTER JOIN "+
28 " dbo.BOS_PI_Division ON dbo.BOS_PI_Employee.szDivisionId = dbo.BOS_PI_Division.szDivisionId LEFT OUTER JOIN "+
29 " dbo.BOS_PI_Team ON dbo.BOS_PI_Employee.szTeamId = dbo.BOS_PI_Team.szTeamId LEFT OUTER JOIN "+
30 " dbo.BOS_PI_Employee BOS_PI_Employee_1 ON dbo.BOS_PI_Employee.szSupervisorId = BOS_PI_Employee_1.szEmployeeId ";
31 //"WHERE dbo.BOS_PI_Employee.szEmployeeId = '"+szSalesmanID+"'";
32 //" WHERE BOS_GL_Workplace.WpszState = '" + szProvince + "' AND BOS_PI_Employee.szName = '" + szsalesPrsn + "' AND BOS_PI_Employee_1.szName = '" + szSupervisor + "'";
34 string wheretext = " dbo.BOS_PI_Employee.szEmployeeId = '"+szSalesmanID+"'";
35 string queryLastSls;
36 //AddQstrWhere(szSalesmanID,wheretext);
37 if(szSalesmanID==string.Empty)
38 {
39 queryLastSls = querySalesPerson;
40 }
41 else
42 {
43 //string querySlsPerson;
44 AddQstrWhere(ref queryLastSls,wheretext);
46 queryLastSls = querySalesPerson + querySlsPerson;
47 }
49 OleDbCommand comd = Tex.GetTextCommand();
50 comd.CommandText = queryLastSls;
52 DataTable slTable = new DataTable();
53 OleDbDataAdapter adapt = new OleDbDataAdapter(comd);
54 adapt.Fill(slTable);
57 ArrayList DataSalesArr = new ArrayList();
58 foreach(DataRow row in slTable.Rows)
59 {
60 CSDatasales sls = new CSDatasales();
61 sls.sz_province = row["WpszState"].ToString();
62 sls.sz_supervisorname = row["szName"].ToString();
63 sls.sz_salemanname = row["Expr1"].ToString();
64 sls.sz_salesmancode = row["szEmployeeId"].ToString();
65 sls.sz_Divisi = row["Divisi"].ToString();
66 sls.sz_typeOp = row["szDescription"].ToString();
68 DataSalesArr.Add(sls);
69 }
70 Tex.CloseConnection();
71 //AddQstrWhere("",wheretext);
73 return (DataSalesArr);
75 }
76 catch(Exception ex)
77 {
78 throw ex;
79 }
81 }
82 You see I want to make the query more dynamic. So instead of making the SQL parameter permanent I wanna make it dynamic, so the usercan choose whether they want to use the parameter or not. I already declare the parameter which is szSalesmanID. There's a function called AddQStrWhere which can make the query more dynamic. But the thing is when I wanna use the parameter it seems the code doesn't take it, it just use the regular query I dont know why.I already use the function but it just wont work, can you guys tell me what's wrong, Please I really do need some help from you guys, feelin; a lil' bit desperate in here.I appreciate any kinds of help, thanks. FYI: I use Visual Studio.NET 2003, SQL Server 2000.Best Regards.   

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May 14, 2008

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Dec 16, 2003

Hi all,

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I have proved with this functions...

SET DATEFIRST 1 (to configure Monday as first day of week)


With this I have the day of the current week... but I can't put my week in this function... aarrgggg.

Please help me...

Thanks a lot.

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Jul 20, 2001

I'm trying to use the date() function in an openquery statement in query analyzer and I keep getting an illegal symbol ")" error. The statement is :

select *
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Hello all,

Recently I changed over a ASP script from our old Access 97 database to our new SQL database. When I changed it over, some of my SQL pulls on my Active Server Page started to give me erros. One of them is the function
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Then it worked fine. When I redirected the ASP to the new SQL server I recieved an error like this:

Microsoft OLE DB Provider for SQL Server error '80040e14'

'Date' is not a recognized function name.

/scripts/order/shippingstatsclose.asp, line 45

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I would like to create a FOXPRO type OCCURS function:

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If FLAGS is a VARCHAR(7) and equals "YYYYNNN" then OCCURS would return 4 and the row would return. The database that I am

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' Can this be compiled into a DLL and
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Public Function OCCURS(expr1 As String, expr2 As String) As Integer
Dim i As Integer
Dim count As Integer
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count = count + Abs((Mid(expr2, i, 1) = expr1))
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Mar 2, 2001

1.I am trying to write following query in SQLserver(this is oracle query),
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Note: this is part of a stored procedure...

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Oct 28, 1999

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Jan 15, 1999

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May 19, 2005

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Firstly can I use iso date times (yyyy-mm-dd hh:mm:ss)

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PHP Code:

 $today = "2005-05-19 21:13:00";

$querystr = "
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        DAYOFMONTH('$today')    as js_dayofmonth,
        MONTH('$today')         as js_month,
        YEAR('$today')          as js_year,
        HOUR('$today')          as js_hour,
        MINUTE('$today')        as js_minute,
        p.p_name, p.p_hours as priority_hours,
        ct.cont_name, ct.sunday, ct.monday, ct.tuesday, ct.wednesday, ct.thursday,
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        HOUR(ct.start_time)   as ss_hour,
        MINUTE(ct.start_time) as ss_minute,
        HOUR(ct.end_time)     as se_hour,
        MINUTE(ct.end_time)   as se_minute,
        (time_to_sec(ct.end_time)-time_to_sec(ct.start_time))/60 as std_minutes
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    WHERE c.cust_id = $cust_id
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Nov 23, 2004

Dear Everybody,

Hi again!

Supposing I have an SQL Server Function named Fxn1 which returns a VARCHAR(6) value. I want to use this returned value in another function named Fxn2 but Fxn2 accepts a parameter of type INT. Fxn2 itself returns an INT value. This has to be achieved in a single line.

The following line of code will not work in SQL Server. How should I achieve this?

declare @Res INT
EXEC @Res = Fxn2 (CONVERT( INT, Fxn1 ))

Thanx in advance!

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How can I pick out a "top child" in SQL Server 2000?


| Employee || code || action date |
| 00000001 || AAA || 01/02/2005 |
| 00000001 || DDD || 01/02/2001 |
| 00000001 || CCC || 01/06/2000 |
| 00000002 || AAA || 01/02/2006 |
| 00000002 || CCC || 01/10/2004 |
| 00000003 || DDD || 05/12/2001 |
| 00000004 || AAA || 09/09/2006 |
| 00000004 || SSS || 09/06/2000 |

I want to pick out the record with the latest date for every employee so I end up with something like this:

| Employee || code || action date |
| 00000001 || AAA || 01/02/2005 |
| 00000002 || AAA || 01/02/2006 |
| 00000003 || DDD || 05/12/2001 |
| 00000004 || AAA || 09/09/2006 |

Any ideas?
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I have a main table that stores the names of all the tables in that database & the next pkey that the record in the respective table should have when a new record is inserted in it(This is the requirement). I am writing a function which returns the primary key of the tablename entered.

The function that i have written is as follows:

CREATE Function next_pkey(@in_tablename varchar(250),@in_increment int)
DECLARE @nextid int
DECLARE @out_nextid int
SET @out_nextid = -1
UPDATE main_ids SET nextid = nextid + @in_increment WHERE tablename = @in_tablename
INSERT INTO main_ids (tablename, nextid) VALUES (@in_tablename, 1 + @in_increment)
SET @nextid = 1
SELECT @nextid = nextid - @in_increment FROM main_ids WHERE tablename = @in_tablename
IF (@@ERROR = 0)
SET @out_nextid = @nextid
Return @out_nextid

This function gives 2 erros as mentioned below:
Invalid use of 'UPDATE' within a function.
Invalid use of 'INSERT' within a function.

I have the following query:
Is an update statement allowed in a function?

Can you tell me what should i do so that this function executes properly???
Plz Help?????

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