Waitfor NULL

Jan 13, 2006

I have an issue where I am trying to copy between 10-100 TIFF images to a directory, use the command line to combine them (I have a command line driven utility to accomplish this), copy the combined TIFF to another directory, and move to another set of TIFF images.

I can't figure out to make SQL wait for xp_cmdshell to return NULL and then move through the loop. Is there a way to use WAITFOR to look to see what is returned and then move on?

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Waitfor Time Vs Waitfor Delay

May 21, 2004

Whats the difference between waitfor time and waitfor delay in SQL Sever2000.

Which one is better if you want to send a file at a certain time?

Thanks,

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WAITFOR DELAY '000:00:05'

Jul 23, 2005

Env: SQL Server 2000It actually waited for 50 seconds instead of 5, triedWAITFOR DELAY '000:00:005' and WAITFOR DELAY '000:00:5' respectively,and got same behavior. Bug or ?TIA

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WAITFOR DELAY

Jul 20, 2005

System: Dell PowerEdge Server with 3 GB RAM, 2.4 GHz CeleronSoftware: Microsoft SQL Server 2000 Enterprise running on Windows 2003ServerSoftware: Microsoft SQL Server 2000 Enterprise running on Windows 2000ServerIf you run the code below, you'll notice something odd occuring. TheMilliSecond value does not change after a 1Millisecond delay. Is this a bugor am I doing something wrong?Any assistance will be greatly appreciated-----------------------------------------------------------------------------------/*Programmer : Des L. DavisDate : July 4, 2004Purpose : Testing Delayed Reaction*/CREATE PROCEDURE [sp_TestDelay] ASDECLARE @DELAYPERIOD NCHAR(12)SET @DELAYPERIOD = '00:00:00:001'DECLARE @Retries INTSET @Retries = 0DECLARE @MAXTRIES INTSET @MAXTRIES = 1000 -- Maximum number of tries before timing outDECLARE @Modified DATETIMEWHILE ( ( @Retries <= @MAXTRIES ) ) BEGINSET @Modified = GetDate() -- Set Modification DatePRINT @RetriesPRINT @ModifiedPRINT 'Year = ' + CONVERT( NCHAR(4), DATEPART( YEAR, @Modified ) )PRINT 'DayOfYear = ' + CONVERT( NCHAR(3), DATEPART( DAYOFYEAR ,@Modified ) )PRINT 'Hour = ' + CONVERT( NCHAR(2), DATEPART( HOUR, @Modified ) )PRINT 'Minute = ' + CONVERT( NCHAR(2), DATEPART( MINUTE, @Modified ) )PRINT 'Second = ' + CONVERT( NCHAR(2), DATEPART( SECOND, @Modified ) )PRINT 'MilliSecond = ' + CONVERT( NCHAR(3), DATEPART( MILLISECOND,@Modified ) )SET @Retries = @Retries + 1 -- Increment loop counter and retryWAITFOR DELAY @DELAYPERIODENDGO-----------------------------------------------------------------------------------

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Sep 25, 2000

Hi,
I created a stored procedure that run as a service in the SQL Server , as long as the server is up.
It queries a table , does some work on the rows one by one , and after each row is done - deletes it from the table.
If there is no data - it goes to 'sleep' - waitfor delay ('00:00:03')

does anyone knows if that waitfor command releases the cpu , or just counting and uses the cpu ?
Eyal.

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WAITFOR DELAY Too Slow?

Jun 23, 2006

http://www.castellcomputers.com/?p=44

This bit of SQL script can be used to insert a pause of one hundredth of a second in a trigger, stored procedure or SQL script. This can be useful for when MSSQL’s built-in WAITFOR DELAY function is just too long (it’s minimum increment is a full second!)

declare @later datetime
declare @now datetime
set @later = current_timestamp+'00:00:00.01'
set @now = current_timestamp
while @now < @later
begin
set @now = current_timestamp
end

I'm sure it could be further tweaked to become a function.. And heck, maybe one of the gurus will tell me that there's something i don't know about WAITFOR or whatnot.. Feedback appreciated!

--
Doug Castell
GoldMine Guru
www.castellcomputers.com

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Stored Procedure Waitfor Question

Nov 28, 2003

The following code does work but when the stored procedure is called it takes about 10 seconds for it to load. I am not refering to the 30 minute wait before the name is deleted.

Anyone have any ideas why the call would be so slow? Thanks.

SERVICE CODE
conPubs = (New SqlConnection("Server=blah blah blah")
cmdCommand = New SqlCommand("DeleteName", conPubs)
cmdCommand.CommandType = CommandType.StoredProcedure
cmdCommand.Parameters.Add("@Name", Name)
cmdCommand.Parameters.Item(0).Value = Name
conPubs.Open()
cmdCommand.ExecuteNonQuery()
conPubs.Close()

STOREDPROCEDURE CODE
Create Procedure[DeleteName]
@Name varchar (30)
As
Begin
Set NoCount On
WaitFor Delay "00:30:00"
Delete From NameTable Where Name = @Name
End
GO

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Lock Table For Queries With Query WAITFOR

Sep 13, 2007

Hi all.

How can I lock table with longtime query?

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Oct 4, 2007

I'm implementing a transactional receive from SSB queue. I used System.Transactions.TransactionScope to simplify the transaction management code. When I used the "WAITFOR (RECEIVE ...), TIMEOUT 100" statment I get TransactionAbortedException when I try to open the second connection under the same TransactionScope block.

Note that when I remove the WAITFOR and just doing RECEIVE everything works fine and the transaction state is guaranteed.

Does anybody know if this a known issue with WAITFOR? Does it supposed to abort the transaction when the command completes?

See code below and stack traces I got.

Thanks,

Noam Helfman

Repro code:




Code Blockusing (TransactionScope txnScope = new
TransactionScope(TransactionScopeOption.RequiresNew))
{
using (SqlConnection conn1 = new SqlConnection(TestConnectionString))
{
conn1.Open();

using (SqlCommand command = conn1.CreateCommand())
{
command.CommandText =
"WAITFOR (RECEIVE TOP(1) message_body FROM TestReceiveQueue), TIMEOUT 100"; // <-- this causes TransactionAbortedException below
//command.CommandText = "RECEIVE TOP(1) message_body FROM TestReceiveQueue"; // <-- this works

command.CommandType = CommandType.Text;

using (SqlDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
byte[] message = (byte[])reader["message_body"];
}
}
}

using (SqlConnection conn2 = new SqlConnection(TestConnectionString))
{
conn2.Open(); // <-- TransactionAbortedException here

using (SqlCommand command = conn2.CreateCommand())
{
command.CommandText = string.Format("INSERT INTO tbl1 VALUES (1)");
command.CommandType = CommandType.Text;

command.ExecuteNonQuery();
}


}

txnScope.Complete();
}
}
...




Schema:




Code BlockCREATE QUEUE TestReceiveQueue WITH STATUS=ON ,RETENTION=OFF;
CREATE TABLE tbl1 (col1 int not null);




Stack traces:



Code Block
System.Data.SqlClient.SqlException: Cannot promote the transaction to a distributed transaction because there is an active save point in this transaction.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject
stateObj)
at System.Data.SqlClient.TdsParser.TdsExecuteTransactionManagerRequest(Byte[] buffer, TransactionManagerRequestType request, String transactionName, TransactionManagerIsolationLevel isoLevel, Int32 timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransactionYukon(TransactionRequest transactionRequest, String transactionName, IsolationLevel iso, SqlInternalTransaction internalTransaction)
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransaction(TransactionRequest transactionRequest, String name, IsolationLevel iso, SqlInternalTransaction internalTransaction)
at System.Data.SqlClient.SqlDelegatedTransaction.Promote()

System.Transactions.TransactionPromotionException: Failure while attempting to promote transaction.
at System.Data.SqlClient.SqlDelegatedTransaction.Promote()
at System.Transactions.TransactionStatePSPEOperation.PSPEPromote(InternalTransaction tx)
at System.Transactions.TransactionStateDelegatedBase.EnterState(InternalTransaction tx)

System.Transactions.TransactionAbortedException: The transaction has aborted.
at System.Transactions.TransactionStateAborted.CheckForFinishedTransaction(InternalTransaction tx)
at System.Transactions.EnlistableStates.Promote(InternalTransaction tx)
at System.Transactions.Transaction.Promote()
at System.Transactions.TransactionInterop.ConvertToOletxTransaction(Transaction transaction)
at System.Transactions.TransactionInterop.GetExportCookie(Transaction transaction, Byte[] whereabouts)
at System.Data.SqlClient.SqlInternalConnection.EnlistNonNull(Transaction tx)
at System.Data.SqlClient.SqlInternalConnection.Enlist(Transaction tx)
at System.Data.SqlClient.SqlInternalConnectionTds.Activate(Transaction transaction)
at System.Data.ProviderBase.DbConnectionInternal.ActivateConnection(Transaction transaction)
at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)
at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, dbConnectionFactory connectionFactory)
at System.Data.SqlClient.SqlConnection.Open()
at SqlServiceBrokerQueueTest.WAITFORBug() in SqlServiceBrokerQueueTest.cs:line 375


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Oct 19, 2015

We're trying to troubleshoot a timeout issue, so it was requested that I add a WAITFOR statement (1 hour) in a certain stored proc our application uses. I added it and confirmed that it was working by executing the stored proc in SSMS.

However, when our application (using Entity Framework) calls the stored proc, the WAITFOR statement is ignored.

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Sep 20, 2006

Hey. I need to substitute a value from a table if the input var is null. This is fine if the value coming from table is not null. But, it the table value is also null, it doesn't work. The problem I'm getting is in the isnull line which is in Dark green color because @inFileVersion is set to null explicitly and when the isnull function evaluates, value returned from DR.FileVersion is also null which is correct. I want the null=null to return true which is why i set ansi_nulls off. But it doesn't return anything. And the select statement should return something but in my case it returns null. If I comment the isnull statements in the where clause, everything works fine. Please tell me what am I doing wrong. Is it possible to do this without setting the ansi_nulls to off??? Thank you

set ansi_nulls off


go

declare

@inFileName VARCHAR (100),

@inFileSize INT,

@Id int,

@inlanguageid INT,

@inFileVersion VARCHAR (100),

@ExeState int

set @inFileName = 'A0006337.EXE'

set @inFileSize = 28796

set @Id= 1

set @inlanguageid =null

set @inFileVersion =NULL

set @ExeState =0

select Dr.StateID from table1 dR

where

DR.[FileName] = @inFileName

AND DR.FileSize =@inFileSize

AND DR.FileVersion = isnull(@inFileVersion,DR.FileVersion)

AND DR.languageid = isnull(@inlanguageid,null)

AND DR.[ID]= @ID

)

go

set ansi_nulls on

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Is it possible through SSRS designer?

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I have a flat file with the following columns

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SampleID and Product are blank for the rest of the rows. So my task is to fill those blank rows with the first row that has the sampleID and Product and load into the table.

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May 3, 2007

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The report works fine when I tell it to create a history entry; however, when I try to add a subscription it doesn't appear to like the null parameter value. Since I have told the report to have a default value of null it doesn't allow me to enter a value on the subscription page.

Now, I suppose I could remove the parameter altogether from the stored proc, but then the users would never be able to run the report for a previous time period. Can someone explain to me why default values aren't allowed to be used on subscriptions when they seem to work fine for ad hoc and scheduled reports? This is really quite frustrating as most of my reports require a date value and default to null so that the user doesn't have to enter them for the latest data.



An internal error occurred on the report server. See the error log for more details. (rsInternalError) Get Online Help




Key cannot be null. Parameter name: key

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Nov 5, 2007

I run a stored procedure for which I have a return variable. The stored procedure returns the ID of a row in a table if it exists:

m_sqlCmd.ExecuteScalar();

The m_sqlCmd has been fed an SQLParameter with direction set to output.
When the stored proc returns, I want to test it. Now when there IS a row it returns the ID ok.
When the row doesn't exist, in my watch I have:

m_sqlParam.SqlValue with value {Null}

I can't seem to work out how to test this value out.
I've tried several things but none seem to work.

This line compiles ok, but the following runs into the IF statement as if the SqlValue is null??

if (m_sqlParam.SqlValue != null)....
{

// I'm here!! I thought the watch says this is null???
}

Sorry if this is obvious, but I can't work this one out!!

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Apr 2, 2007

I am getting this error: "Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails." -- But my value is not null. I did a response.write on it and it show the value. Of course, it would be nice if I could do a breakpoint but that doesn't seem to be working. I'll attach a couple of images below of my code, the error, and the breakpoint error.
 

 
 

Server Error in '/' Application.


Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.Source Error:



Line 89: sContact.Phone = sPhone.Text.Trim
Line 90: sContact.Email = sEmail.Text.Trim
Line 91: sContact.Save()
Line 92:
Line 93: Dim bContact As Contact = New Contact()Source File: F:InetpubwwwrootOutman KnifeCheckout.aspx.vb    Line: 91 Stack Trace:



[SqlException (0x80131904): Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +857354
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734966
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1838
System.Data.SqlClient.SqlDataReader.HasMoreRows() +150
System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout) +214
System.Data.SqlClient.SqlDataReader.Read() +9
System.Data.SqlClient.SqlCommand.CompleteExecuteScalar(SqlDataReader ds, Boolean returnSqlValue) +39
System.Data.SqlClient.SqlCommand.ExecuteScalar() +148
SubSonic.SqlDataProvider.ExecuteScalar(QueryCommand qry) +209
SubSonic.DataService.ExecuteScalar(QueryCommand cmd) +37
SubSonic.ActiveRecord`1.Save(String userName) +120
SubSonic.ActiveRecord`1.Save() +31
Checkout.btnCheckout_Click(Object sender, EventArgs e) in F:InetpubwwwrootOutman KnifeCheckout.aspx.vb:91
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102



Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42

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Jun 28, 2004

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I tried this command

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but it doesn't change anything

Select NULL + 'TOTO'
----> NULL

(it should be 'TOTO')

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Aug 3, 2005

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May 3, 2006

Hello.

I've built a sample CLR function with the following declaration....

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RETURNS nvarchar(1000)
WITH RETURNS NULL ON NULL INPUT
AS
EXTERNAL NAME Assembly1.[ClassLibrary1.MyVBClass].MyManager

And it works as expected, except when I use NULL:

DECLARE @MyManager nvarchar(1000)
EXEC @MyManager = dbo.GetManager NULL
PRINT @MyManager

It returns the value "Unknown" as it would have for any unknown DeptCode, as-programmed.

I'm of the theory it should have returned NULL without actually firing the function? Or is this only for non-CLR items... or stored procedures, not functions?

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Oct 27, 2015

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Normaly date values are stored here e.g under col 20150901 .

Case 
when col>'20150901' then 'NULL'
else col
end as Derivedcol

Note this is an extract process and we are presenting data by pumping the data in a table .

Now there is another similar column -colz varchar(10)  which stores date but doesnt have case condition so whenever date has no value its shows null which is database null.

So whats the difference between database null and string null ?

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Nov 27, 2000

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The result of A+B concatanation will be stored in a column, C.


Appreciate your help
Ziggy

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Apr 25, 2007

Hi guys,

I've got a query on a particular table returning an odd result:

SELECT DISTINCT WorkStation
FROM Invoice
WHERE WorkStation Is Not Null
ORDER BY WorkStation

This query returns the rows I'd expect plus a null row. This doesn't happen in databases at other sites, or in other tables at this site. The following query behaves as I'd expect returning only non-null AccountNumbers.

SELECT DISTINCT AccountNumber
FROM Suppliers
WHERE AccountNumber Is Not Null
ORDER BY AccountNumber

I can't reproduce these results on another site on a table of the same structure, or on another table at this site.

Any suggestions as to what might be going on?

Pertinent info:
---
select @@Version

Microsoft SQL Server 2000 - 8.00.760 (Intel X86)
Dec 17 2002 14:22:05 Copyright (c) 1988-2003 Microsoft Corporation
Standard Edition on Windows NT 5.2 (Build 3790: Service Pack 1)
---
dbcc checkdb
Abridged result:
CHECKDB found 0 allocation errors and 0 consistency errors in database 'POS'.
---
SELECT * INTO #Inv FROM Invoice

SELECT DISTINCT WorkStation
FROM #Inv
WHERE WorkStation Is Not Null
ORDER BY WorkStation

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TIA,
Karl.

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Apr 27, 2007

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Feb 28, 2008

Hi all,

One of my columns is the table has some Null values, and I Would like to stop having NULL values into that column any more.

I know, If I alter the column to NOT NULL will throw me an error, since it does a batch update.

Is there any way to achieve this...

Thanks...

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Aug 15, 2006

ok here is a WIERD issue.

I've NEVER EVER had this issue, I have always done this and it works great both locally and remotely.

 

I have a table, which is a "customers" table.

I have a stored procedure which takes in parameters (name, address, password etc...) and returns me back, via a parameter declared as output - the customer ID.

I've always done this, and works great.

Now, this works fine locally.

 

IF I try to run this/do the exact same execution of commands (create a customer) remotely (where the database is stored, so copying everything from local to "over there") it does not work.

I get a DBNULL value back from the parameter, declared as an int output.

 

IF I copy and paste this Stored procedure Query/command into Query Analyzer and execute it (on the remote connection) and run it, giving it the exact same values as I do, it works perfect and returns me the correct value.

 

I've even dropped and recreated the stored procedure but makes no difference.

 

Any ideas why?

 

here is the proc....

 



CREATE PROCEDURE [dbo].[DoCreateNewCustomer] (
@theFirstName nvarchar(25),
@theLastName nvarchar(25),
@theAddress nvarchar(50),
@theCity nvarchar(15),
@thePostCode nvarchar(9),
@thePhoneNumber nvarchar(21),
@theMobilePhoneNumber nvarchar(21),
@theIPAddress nvarchar(25),
@thePassword nvarchar(50),
@theEmailAddress nvarchar(30),
@result int output
)
AS
SET @result = (SELECT [ID] FROM Customers WHERE emailAddress = @theEmailAddress)
IF @result IS NOT NULL 
 SET @result = -1
ELSE
BEGIN
 SET @result = @@IDENTITY
 INSERT INTO Customers (
 
 Firstname,
 Lastname,
 Address,
 City,
 Postcode,
 PhoneNumber,
 MobileNumber,
 IPAddress,
 [Password],
 EmailAddress
 
 )
 
 VALUES (
 
 @theFirstName,
 @theLastName,
 @theAddress,
 @theCity,
 @thePostCode,
 @thePhoneNumber,
 @theMobilePhoneNumber,
 @theIPAddress,
 @thePassword,
 @theEmailAddress
 )
 
END
GO


 

 

 

Any ideas why it does not work when calling the stored proc from either a web app, or through QA remotely but works fine when I run that command in QA or locally?

 

Again, if I do:

 

EXEC DoCreateNewCustomer { params } - the output result it gives me is DBNULL (if on remote connection)

If I do this locally, perfect

 

If I copy and paste pretty much the SP into QA and execute it on the remote connection, works great, and also locally.

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Change The Column From NULL To NOT NULL

Feb 29, 2008

Hi all,


One of my columns is the table has some Null values, and I Would like to stop having NULL values into that column any more.


I know, If I alter the column to NOT NULL will throw me an error, since it does a batch update.


Is there any way to achieve this...


Thanks...

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-- Ryan

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May 22, 2008

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May 22, 2003

Hello all
I am trying to run a sql statement, (without having to run stored procedures), that will lookup a value stored in a Record.field., otherwise ignore the value if it is blank. I have a field tied to a Microsoft Access form - ItemLocation. If the user selects a unique ItemLocation the report will attempt to locate all values within that ItemLocation. If the user decides to leave the field blank, I would like for it to return all values for every ItemLocation. If anyone can help, I would really appreciate it. I will attach code. My problem is the last line of this SQL statement. If F.ITemLocation is null, I get no data. I would like for it to return everything. Thank you.

Code:
SELECT DISTINCT
B.BarCodeID,
A.ItemDescription,
A.ItemCategory,
A.TypeOfItem,
A.SerialNumber,
B.ItemLocation,
B.LocationID,
B.LastUpdate,
B.TrackItID,
B.UserID
FROM
tblMISFixedAssetTable A,
tblMISFixedAssetTable2 B
WHERE A.BarCodeID = B.BarCodeID
AND A.DisposalDate is null
AND B.LastUpdate = (Select Max(C.LastUpdate)
from tblMISFixedAssetTable2 C
Where B.BarCodeID = C.BarCodeID)
AND B.BarCodeID in (Select D.BarCodeID
from tblMISFixedAssetTable3 D
Where D.FiscalYear = (Select E.FiscalYear
from tblReportFY E))
AND B.ItemLocation = (Select F.ItemLocation
from tblReportFY F)

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