Storage Of Null Columns

May 23, 2007

Hi,

This question comes without the wish for any philosofical debates concerning NULL



Normally SQL Server 2005 uses 13 bytes to store a NUMERIC(22,7) value. Does it use the full 13 bytes when the column contains NULL as well? And what about DATETIME and (BIG)INT? Most of the info on storage of NULL values is about varchar/char/nvarchar/varchar...



Thnx, Jeroen.

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How Much Storage Does A Null Xml Datatype Column Use If...

Sep 27, 2007


1) it is in the same filegroup as the rest of the table?
2) it is stored in a filegroup separately from the rest of the table (I think this is allowed)?

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SQL Server 2012 :: Storage Of VARCHAR (MAX) When Null

May 7, 2014

If I have a table

CREATE TABLE [dbo].[logg](
[Id] [bigint] IDENTITY(1,1) NOT NULL,
[Details] [varchar](MAX) NULL)

insert logg (Details) values('')
insert logg (Details) values(null)

Will both statements above access only a single page (as it fits into one page) or does the VARCHAR(MAX) always put its data on a separate page. If so, is the null insert treated differently from the '' insert?

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Jul 20, 2005

Hi ,This is related to datawarehouse , data mining . We are told that datamining tools such as spss or sas , need a large table which has lotsof columns inside . Based on our project , out final table which willbe used in data mining , has lots of computed values . The finalnumber of columns of the table is 7800!(lots of calculated values)First of all , i dont see the reason of this requirement of the datamining tools. I will be appreciated if someone can clarify this: Whydoes a data mining tool need such a large table?The main issue is if i create table with 7800 columns inside ( in factoracle only allows to create table with 1000 columns) , i believe itcant be queried.My basic calculation shows that the average row size of this tablewill be 160kb. , considering my db_block_size of 16kb. this means 10blocks for 1 row. (The table will have more than 10.000.000 rows) Nomatter how fast my disk subsystem is , i think the queries againstthis table will fail. So what can i do? May be I need a differenttype of storage technique for instance column based storage ( i heardthat sysbase has this feature , dont know the details / purpose..)How can i solve such a problem? The database server really does notmatter , it can be oracle,sqlserver , sybase,informix , etc... I willbe appreciated if someone can help me abut the issue.Kind Regards,hope

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Aug 17, 2006

Dear all,

In my current database design, there is one table (PState) which has a Primary Key (int) and a few other fields.

During development, a pattern started to arise; for certain rows in PState, I wanted to specify an additional set of columns (over 10 of them with quite large lengths) for each row in PState. However, as these additional columns would only be required in approximately 20% of the rows of PState, there would be plenty of NULL values in PState if I would make this table wider than necessary. So, I decided to create a separate table with those optional columns (PStateWFI). In order to attach these additional columns in PStateWFI to PState in the cases they were needed, I would obviously have to create a Foreign Key constraint on the Primary Key of PStateWFI so that these optional rows would know which row in PState they would belong to.

However, the problem with this approach is that one could define multiple rows in PStateWFI referring to the same row in PState, which would not make sense. Thus, a UNIQUE index constraint added to the constrained ID column in PStateWFI would make sense to ensure that there could only be one set of optional columns added to each row in PState. But now, when adding the UNIQUE index, the FK constraint started to appear as a bidirectional key link in the Diagram; hence, new entries in PState would have to meet a FK constraint based on PStateWFI, which was not intended.

Hence, I had to create a quite awkward design to enforce the constraints:

1. The PState table has a Primary Key (PState.ParticleID, int, Identity Specification: Yes)
2. The PStateWFI table has a Primary Key (PstateWFIID, int, Identity Specification: Yes)
3. PStateWFI has field "PStateID" which has a FK constraint to PState.ParticleID (which is a one-way constraint operating in the correct way and does not constrain insertions in PState)
4. PStateWFI has an additional column ParticleIDIndex which has a UNIQUE Index attached to it.
5. There is a check constraint on PStateWFI enforcing PStateWFI.ParticleIDIndex = PStateWFI.ParticleID.

Although this structure does the job, it makes it necessary to add a redundant column in PStateWFI by duplicating the PStateWFI.ParticleID into PStateWFI.ParticleIDIndex, since I can't create a UNIQUE index on PStateWFI.ParticleID without constraining the PState table as well. So, insertions into this table would have to insert the same value into two columns. Not a big deal, but appears slightly ugly.

Basically I'd hope someone could explain why a bidirectional FK constraint has to be enforced on the primary key table in a relationship when the constrained column in the primary key table has a UNIQUE index attached on it. I have a few other cases where the above approach would benefit from a more clear structure.

Thanks in advance for any advice.

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Oct 27, 2014

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Description:
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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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Jan 14, 2008

I am a Windows developer for the IBM Tivoli Storage Manager Server (TSMS) product.
Our product installation is built with InstallShield and uses the Windows Installer.

On a new installation of Windows 2003 x64 Storage Server R2, at a customer's site, the TSMS product fails to install.
The install of the OS has version 3.01.400.3959 of the Windows Installer and I see no newer version that installs.

Part of our product is 32 bit (console) and another part is x64 (server).
When installing I can see that the install's default is being redirected/reset to C:Program Files (x86)TivoliTSM after it is explicitly set by a custom action to ..Program Files.. . I further observe that our custom actions to write 64 bit registry entries are being refused.

REGSAM samMask = KEY_ALL_ACCESS;
if ( regIsWow64Process () ) samMask = samMask | KEY_WOW64_64KEY;
lStatus = RegCreateKeyEx( hLocalConnectKeyRoot,
szSubkey,
0L,
NULL,
REG_OPTION_NON_VOLATILE,
samMask,
NULL,
hKey,
&dw ) ;
The above fails to create the key.

We have tried four versions of our TSMS spanning many changes but the install acts the same.
This does not happen on any other Windows OS we test on but we do not test on Windows 2003 Storage Server R2 being that it is an OEM product. We did test on Windows server 2003 R2 x64 and do not see this problem.

Do you have any suggestions on how to tackle this problem?
I have full installation traces but can only see that the registry work is being refused. I can't see why.

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what would be the best way to have new as well as existing
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hi, I have a problem with a flat file and a table

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Since I can solve this problem???




helps please

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If I had a basic table with 3 VARCHAR fields; let's say A, B, C

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Ideally, it would be something like:

SELECT
CAST (A IS NULL) AS INTEGER
+ CAST (B IS NULL) AS INTEGER
+ CAST (C IS NULL) AS INTEGER
FROM MyTable

That doesn't work at all. I can't seem to do "IS NULL" in the SELECT area. Should I write a T-SQL user-defined function that takes all three columns as parameters? Would that be performance friendly for large data sets?

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Apr 14, 2015

Content table

deleteddate revokeddate
1/1/2001 null
null 2/2/2003
4/5/2004 null

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deleteddate revokeddate
1/1/2001 null
null null
4/5/2004 null

I started off as below, But I am getting incorrect values.

Declare @deleterevoke bit
Declare @DelRevId int
Declare @DelRevnumrows int
Declare @tempDeletedDate datetime
Declare @tempRevokedDate datetime

[code]....

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Feb 20, 2006

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Jun 14, 2007

This procedure doesnt increment the "Views" column like it should when the value is NULL (not zero)

CREATE procedure [dbo].[sp_theDb_image_addView]
@imageId int
AS

SELECT [views],
CASE WHEN [views] is null then 1
END

FROM theDb_image WHERE imageId=@imageI

UPDATE theDb_image SET [views] = [views] + 1 WHERE imageId=@imageI

The CASE statement apparently isn't working.... any advice?

Thanks.

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Jul 20, 2005

Using SQL2000. I want to return the # of columns with non-nullvalues. Here's my query so far:selectcase when Dx1 is not null then 0 else 1 end +case when Dx2 is not null then 0 else 1 end +case when Dx3 is not null then 0 else 1 end +case when Dx4 is not null then 0 else 1 end as DxCountfrom tblClerkshipDataCleanwhere PalmName = @PalmNameThere are 7 rows for the particular PalmName I'm using. The queryreturns a result of 7. However, there are 25 values in Dx1 thru Dx4so the query should be returning 25.What am I doing wrong here? Thanks in advance.

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Jul 6, 2006

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I want to run a query that selects rows from the table where a datetime column has null values;
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However i get this error:
Conversion failed when converting datetime from character string.
Any help appreciated 
 

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Feb 5, 2008

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In my code (c#) ive used Nullable DateTime, but when I try to assign a nullable Datetime to a DateTime column, I get this error
cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'
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In the schema file, the DateTime columns have <DBNULL> as the default value, AllowBDNull is true, but I am only allowed 'Throw exception' on the NULL value property
I could probably do this another way (by not using a schema and writing the code myself)  but Id prefer to keep the strongly typed code.
 I dont want to use MAx or MIn values for the default datetime values, so how can this be done ?

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Sep 7, 2004

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int count = (int)row["Count"];

and

int count = row["Count"] as int;


the first one throws an exception when Count is null and the second doesn't compile at all since 'as' applies to reference types, so what is the way other than exception handling to determine null value in a column?

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Jan 11, 2005

Hello,
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Thanks,
Bryan

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Aug 14, 2014

I am trying to divide these two columns...

parsename('$'+ Convert(varchar,Convert(money,Q.[Product Cost]-R.[Shared Cost]),1),2) as [Pre Cost],
parsename('$'+ Convert(varchar,Convert(money,R.[New Product Cost]-R.[Shared Cost]),1),2) as [Post Cost]

Formula:
[Post Cost] / [Pre Cost]

Expected:

If [Post Cost] is null then I would need to assign 1 and divide by [Pre Cost] and similarly if [Pre Cost] is null then I would need to assign 1 so that I can divide [Post Cost] / [Pre Cost]

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Dec 22, 2005

Table DDL below:The tables I have contain Timesheet information. Each row in thetblTSCollected table contains an entry for an employee into thetimesheet system, specifically by scanning the barcode on their badge.A whole bunch of business logic periodically attempts to "pair" theseinto logically matched scans. For example, some employees will scan inand out of a single place of work. For these there will be a rowwritten to the tblTSRuleApplied table which contains, inter alia andsome redundant data, the fldCollectedID for the two rows. The earlierwill be put into the fldStartTimeCollectedID, and the later into thefldEndTimeCollectedID. Some employees will clock on at their base,then perform sub-duties at different locations during the day, andclock off at their home base at the end of their shift. For these, thesystem would identify the outer records as a matching pair, and thenpair up inner records by location.However, if the employee fails to enter a valid "clocking in and out"pair (for example, if they clock in at the wrong location) the systemneeds to generate a "dummy" "clocking in and out" record for thepayroll department. Ideally, this would have NULL values in thefldStartTimeCollectedID and fldEndTimeCollectedID columns. This wouldalert a user in a different part of the system, where missingtimesheets were being arbitrated, that an employee appeared to havefailed to clock in for that day. Of course, the user could seeon-screen that they had clocked in, but at an incorrect location.Unfortunately, the database designer is not here for the moment (he wasknocked off his bicycle recently), but he put a unique index on thetblTSRuleApplied table that prevents the same value being entered intothe fldStartTimeCollectedID and fldEndTimeCollectedID columns. This isgenerally A Good Thing, since we don't want the same timesheet scan toform both a "clocking on" event and a "clocking off" event.So, is there any way of retaining the requirement that thefldStartTimeCollectedID and the fldEndTimeCollectedID columns may notcontain the same value in a single row, UNLESS that value is NULL inwhich case all is hunky dory. I should add that the clients don't muchcare for Triggers (and neither do I for that matter).Many thanks if you are able to help.Edwardif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[FK_tblTSRuleApplied_tblTSCollected]') andOBJECTPROPERTY(id, N'IsForeignKey') = 1)ALTER TABLE [dbo].[tblTSRuleApplied] DROP CONSTRAINTFK_tblTSRuleApplied_tblTSCollectedGOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[FK_tblTSRuleApplied_tblTSCollected1]') andOBJECTPROPERTY(id, N'IsForeignKey') = 1)ALTER TABLE [dbo].[tblTSRuleApplied] DROP CONSTRAINTFK_tblTSRuleApplied_tblTSCollected1GOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[FK_tblTSArbAccept_tblTSRuleApplied]') andOBJECTPROPERTY(id, N'IsForeignKey') = 1)ALTER TABLE [dbo].[tblTSArbAccept] DROP CONSTRAINTFK_tblTSArbAccept_tblTSRuleAppliedGOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[FK_tblTSCollected_tblTSRuleApplied]') andOBJECTPROPERTY(id, N'IsForeignKey') = 1)ALTER TABLE [dbo].[tblTSCollected] DROP CONSTRAINTFK_tblTSCollected_tblTSRuleAppliedGOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[tblTSCollected]') and OBJECTPROPERTY(id,N'IsUserTable') = 1)drop table [dbo].[tblTSCollected]GOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[tblTSRuleApplied]') and OBJECTPROPERTY(id,N'IsUserTable') = 1)drop table [dbo].[tblTSRuleApplied]GOCREATE TABLE [dbo].[tblTSCollected] ([fldCollectedID] [int] IDENTITY (1, 1) NOT NULL ,[fldEmployeeID] [int] NULL ,[fldLocationCode] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_ASNULL ,[fldTimeStamp] [datetime] NULL ,[fldRuleAppliedID] [int] NULL ,[fldBarCode] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,[fldProcessed] [smallint] NOT NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[tblTSRuleApplied] ([fldEmpRuleID] [int] NOT NULL ,[fldRuleAppliedID] [int] IDENTITY (1, 1) NOT NULL ,[fldStartTime] [datetime] NULL ,[fldEndTime] [datetime] NULL ,[fldStartTimeCollectedID] [int] NULL ,[fldEndTimeCollectedID] [int] NULL ,[fldStartArbStatus] [smallint] NULL ,[fldEndArbStatus] [smallint] NULL ,[fldDurationArbStatus] [smallint] NULL ,[fldPrimary] [smallint] NOT NULL ,[fldDateEntered] [datetime] NULL ,[fldEnteredBy] [int] NULL) ON [PRIMARY]GOALTER TABLE [dbo].[tblTSCollected] WITH NOCHECK ADDCONSTRAINT [DF_tblTSCollected_fldProcessed] DEFAULT (0) FOR[fldProcessed],CONSTRAINT [PK_tblTimesheetCollected] PRIMARY KEY CLUSTERED([fldCollectedID]) WITH FILLFACTOR = 90 ON [PRIMARY]GOALTER TABLE [dbo].[tblTSRuleApplied] WITH NOCHECK ADDCONSTRAINT [DF_tblTSRuleApplied_fldPrimary] DEFAULT (1) FOR[fldPrimary],CONSTRAINT [PK_tblTSRuleApplied] PRIMARY KEY CLUSTERED([fldRuleAppliedID]) WITH FILLFACTOR = 90 ON [PRIMARY] ,CONSTRAINT [IX_tblTSRuleApplied_1] UNIQUE NONCLUSTERED([fldStartTimeCollectedID],[fldEndTimeCollectedID]) WITH FILLFACTOR = 90 ON [PRIMARY]GOALTER TABLE [dbo].[tblTSCollected] ADDCONSTRAINT [FK_tblTSCollected_tblEmployee1] FOREIGN KEY([fldEmployeeID]) REFERENCES [dbo].[tblEmployee] ([fldEmployeeID]),CONSTRAINT [FK_tblTSCollected_tblLocation] FOREIGN KEY([fldLocationCode]) REFERENCES [dbo].[tblLocation] ([fldLocationCode]),CONSTRAINT [FK_tblTSCollected_tblTSRuleApplied] FOREIGN KEY([fldRuleAppliedID]) REFERENCES [dbo].[tblTSRuleApplied] ([fldRuleAppliedID])GOALTER TABLE [dbo].[tblTSRuleApplied] ADDCONSTRAINT [FK_tblTSRuleApplied_tblTSCollected] FOREIGN KEY([fldStartTimeCollectedID]) REFERENCES [dbo].[tblTSCollected] ([fldCollectedID]),CONSTRAINT [FK_tblTSRuleApplied_tblTSCollected1] FOREIGN KEY([fldEndTimeCollectedID]) REFERENCES [dbo].[tblTSCollected] ([fldCollectedID]),CONSTRAINT [FK_tblTSRuleApplied_tblTSDurationStatus] FOREIGN KEY([fldDurationArbStatus]) REFERENCES [dbo].[tblTSDurationStatus] ([fldStatus]),CONSTRAINT [FK_tblTSRuleApplied_tblTSEmpRules] FOREIGN KEY([fldEmpRuleID]) REFERENCES [dbo].[tblTSEmpRules] ([fldEmpRuleID]),CONSTRAINT [FK_tblTSRuleApplied_tblTSTimeStatus] FOREIGN KEY([fldStartArbStatus]) REFERENCES [dbo].[tblTSTimeStatus] ([fldStatus]),CONSTRAINT [FK_tblTSRuleApplied_tblTSTimeStatus1] FOREIGN KEY([fldEndArbStatus]) REFERENCES [dbo].[tblTSTimeStatus] ([fldStatus])GO

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Mar 16, 2006

Hi,

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Sep 21, 2007



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/* SQL Server & Windows NT login name, security access */
USE master
go
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FROM syslogins
WHERE status != 0
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I would like to know how to stop the columns that have a null or 0 value from being returned to me. I don't want to see a bunch of 0s since almost no users do have these privaleges, I'd rather have that be hidden. Do I need to create a view for this? Thank You!

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Sep 28, 2006

Hi All.

     I'm having some issues with what seems to be a simple update statement but is giving me grief when one or both of the columns I'm comparing are null. My statement (simplified) is as follows:-

 

UPDATE
 TAB_A
SET
 TAB_A.TRADCODE = TAB_B.TRADCODE
FROM
 TADS_STAGE.DBO.UNCLBRAMDEPT TAB_B
JOIN
 TADS.DBO.UNCLBRAMDEPT TAB_A
ON
 TAB_B.BRANCODE = TAB_A.BRANCODE
AND
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AND
(
 TAB_B.TRADCODE <> TAB_A.TRADCODE
)

 

If either of the TRADCODE fields (or both) are null then the comparison fails to return the row to update. I've tried setting the ANSI_NULLS setting to off, this has no effect, presumably because it will only work when comparing a column to a variable or evaluating if the column is null itself.

I've considered using ISNULL, but if one of the columns happens to contain the value that I specify as the replacement value then the comparison will result true and not include the row.

 

I'd be grateful for any pointers!

 

Thanks in advance

 

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Hi,

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Thanks in advance

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How I can write a one query statement to do this, we expect to count how many salemancode is not space and count the number of salesman to over the total amount.

total amount / (no_of_saleman) as commission
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Christine the Pharmacist writes "Please pardon as I am not horribly advanced with SQL...

Using SQL Server 2000, Windows 2000, Service pack 4

I'm trying to figure out marketshares for "preferred" products. I have a table put together by hospital and month of medication use with the totals of each drug dispensed in columns as well.
(example table below)


Hospital Month Drug A Drug B Drug C Drug D
A 7 5 10 58 73
B 7 NULL 26 98 43
etc.


** Drug C and Drug D are the preferred drugs

I'm getting correct preferred % in all cases except when a value is NULL (result is NULL). I'm using an aggregate (sum), which should ignore NULLs, but it ignores NULLs within a column, and not ignoring across columns. I've tried setting concat_null_yields_null off and I'm still getting NULL (since I'm using the plus sign).

This is my admittedly confused select statement, suspect this is where my problem lies (problems with saying "sum", but using "+" as well?):

select a.Hospital,a.month,convert(float,sum(c.Drug_C+d.Drug_D))/convert(float,sum(a.Drug_A+b.Drug_B+
c.Drug_C+d.Drug_D)) as preferred_share

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SELECT Person2role.person2roleID,Person.firstname, Person.lastname, Person.sex

FROM Person LEFT OUTER JOIN

Person2Role ON Person.personID = Person2Role.personID

WHERE (Person.firstname LIKE '%' + ISNULL(@firstname + '%', ''))

AND (Person.lastname LIKE '%' + ISNULL(@lastname + '%', ''))

AND (Person.sex = ISNULL(@sex, Person.sex))

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I am working with SQL Server 2005 Express Version

Thank you,

Alex

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