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Disadvantages Using Functions

any disadvanges using user defined functions calling from stored procedures??

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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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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.

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RSSWM.exe base address: 2C000000
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sqlcese30.dll 00E50000 6A000 A
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ssapi.dll 01BB0000 17000 RO, XIP
mscoree2_0.dll 01D90000 C3000 RO, H, S, XIP

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RSSWM.exe base address: 2C000000
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FROM table1

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It works fine with other SQL tools like winsql?


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2 {
3 if(TmpStr=="")
4 {
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6 }
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8 {
9 TmpStr +="AND"+Parameter;
10 }
11 }
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17 {
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22 try
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27 " dbo.BOS_GL_Workplace ON dbo.BOS_PI_Employee.szWorkplaceId = dbo.BOS_GL_Workplace.szWorkplaceId LEFT OUTER JOIN "+
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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 + "'";
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37 if(szSalesmanID==string.Empty)
38 {
39 queryLastSls = querySalesPerson;
40 }
41 else
42 {
43 //string querySlsPerson;
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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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 I hope this is a right form for ADO .net type of question. 
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I have a problem with date functions...

In my program I use weeks, and with this variable I need to know which is the first day of the selected week...

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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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Well, I just downloaded SQL 2005 Express to have a play. Good old Billsays "up and running in 20 minutes"Well 5 hrs, 5 reboots and 4 full un-install and re-install later I havefinally got it working. About what I expected really.Anyway, my question relates to creating user defined functions. I've 10yrs exp in MS Access and VB, and user ent Manager to create views onthe work server, but havnt done much with functions.I'm using the Management Studio Express.I've opened a new view and copied the following sample code but it wontlet me save it.-------------------------IF OBJECT_ID(N'dbo.GetWeekDay', N'FN') IS NOT NULLDROP FUNCTION dbo.GetWeekDay;GOCREATE FUNCTION dbo.GetWeekDay -- function name(@Date datetime) -- input parameter name and datatypeRETURNS int -- return parameter data typeASBEGIN -- begin body definitionRETURN DATEPART (weekday, @Date) -- action performedEND;GO------------------------------------------When I try to save it it says"incorrect syntax near the key work 'IF'incorrect syntax near 'GO'CREATE FUNCTION must be the first statement in a query batchmust declair the scalar variable "@Date"Whats wrong with the syntax???Thanks in advanceGrant

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Date Functions
Hi all,Are there a functions for last day of the month or first day of the month?Thanks in advance,Jen--Fast Track On Line -Web Design and DevelopmentPortfolio mail is certified Virus Free.Checked by AVG anti-virus system ( 6.0.688 / Virus Database: 449 - Release Date: 18/05/2004

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Help With More Advanced Functions
I have been able to get several basic databases to function both in playingaround and functional ones on the web but they have all been pretty simple.I am now trying to develop a database for the web using Access. What I amreally needing help with is how to actually reduce the number of record setsthat I think i am going to need. Here is what I am trying to do.I am having people sign up and create teams. So you come to the site and yousee Team 1, Team 2... Team 8. (These numbers will later be replaced by realnames given by the team captains and replaced in the database, this will bedone by the captain through the web)You pick a team you want to be on, enterthe info and you are placed on that team (in the database) I have two tablesin the database TeamRoster (everyone on all of the teams) and Teams (Listthe captains and the names of their team)So when I query the database to fill the tables I am confused as to how Ishould go about the query. As I see it I need to build a RS (Record Set) foreach team to get the name of the team for the appropriate table, thenpopulate it with the players for that team (repeating region) if there areeight teams, that means 16 RS. This does not seem right.Am I making any sense?Thanks for trying to understand all of this.Houston

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Calling Functions
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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Calling VBA Functions From SQL
I have a rather complex function (part of a production planning engine) that is written in VBA, and is part of my front end app. I'd like to be able to somehow call this function from either a sproc or DTS package in SQL. Is this possible, or am I going to have to convert the function to a SQL sproc (ugh)?

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Max No. Of Parameters In Functions
Can anybody tell me the max no of parameters that we can use in a single

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Various Functions In TSQL
I have a good collection of UDFs in my store,anybody interested to get those plz echo I want...

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CHILD Functions?
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?
Thanks in advance!


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Problem With Functions
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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DATE Functions
Hi all,

The statement

select dateadd(month, -1 , convert(datetime, '30-SEP-1996')
return Aug-30-1996.

but I want to get the last day of the month. (ie AUG-31-1996)
for example
select dateadd(month, -1 , convert(datetime, '30-SEP-1996')
I want MAY-31-1996 to return NOT MAY-30-1997.

Thanks in advance for your help
Tung Nguyen

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Sql6.5 Functions
Hello All,
Does anyone know if stored functions can be written for sql similar to stored procedures? And if theey
can, what language?


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Date Functions
I have a table of sales transactions that I'd like to group by date, but this is a datetime field so it groups by the date and time, and so it returns more records that I want. Is there an easier way to do this other than using the datepart function to build a date? How can I just look at only the date of a datetime field?

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SQL Server7 Functions
I have an Access 97 project written in VB5. It uses a whole bunch of `Format`s, `IIF`s, etc... I would like to be able to move to SQL Server 7 without making any changes to the code - if I could create a function and add it to the SQL Server 7 system. Does anyone know, or can people tell me what they think the best solution is? even if you do not think that what I want is doable, please tell me your thoughts. Thanks...

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Extending Functions In SQL 7.0?
Is there a way to add functions to SQL (other than stored proceedures) to emulate functions in other systems?

I would like to create a FOXPRO type OCCURS function:

Select * FROM Table1 WHERE OCCURS('Y', FLAGS) > 3

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

accessing has >165,000,000 rows and >500 columns per row so you see that I need all the speed I can get!

' This is a VB function which works.
' Can this be compiled into a DLL and
' somehow made available to SQL?
Public Function OCCURS(expr1 As String, expr2 As String) As Integer
Dim i As Integer
Dim count As Integer
For i = 1 To Len(expr2)
count = count + Abs((Mid(expr2, i, 1) = expr1))
OCCURS = count
End Function

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Greatest And Least Functions
1.I am trying to write following query in SQLserver(this is oracle query),
IS their any equivalent for GREATEST and LEAST functions in SQLServer ???

Update mwebtemp
Set Temp_amount1 = (SELECT SUM(AuthAttr_Amount*(num_Business_Days
(GREATEST(AuthAttr_Start_Date, @dtstartdate),
LEAST(AuthAttr_Finish_Date, @dtenddate))))

Note: this is part of a stored procedure...

2. Also how do you write and call a function in SQLServer (syntax ??), eg.num_Business_Days
is a function returning number of business days between the 2 dates....

thanks a lot

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