Creating A Unique Constarint On A Multiple Null Column

Aug 3, 2007



HI,

To create a unique constraint on a multiple nullable column, we need to create a view with not null column and and then create a unique index on that view.

Is this is the only way of doing ?

Thank you.

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Multiple Null In Unique Column, Is It Possible?

Nov 20, 2007

Hi All,



I am having problems with unique contraint, say I have a table called customer
create table customer (
id int identity(1,1) not null,
name nvarchar(50) not null,
id_card_no nvarchar(20) unique,
);
so when I do mutilple null inserts
insert into customer(name, id_card_no)
values("Customer 1", NULL);
insert into customer(name, id_card_no)
values("Customer 2", NULL);
I get an error duplicated keys on the unique column.

In Oracle DB, unique columns are behaved a little different where multiple nulls are allowed in a unique column.

I know there are some tircks that you can do to allow multiple nulls in unique column in sql server(well, pretend to be) like creating a computed column, create a view and an index...



Are there any ways to archieve that in sql sever compact?

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Multiple Null In Unique Column, Is It Possible?

Nov 20, 2007



Hi All,

I am having problems with unique contraint, say I have a table called customer
create table customer (
id int identity(1,1) not null,
name nvarchar(50) not null,
id_card_no nvarchar(20) unique,
);
so when I do mutilple null inserts
insert into customer(name, id_card_no)
values("Customer 1", NULL);
insert into customer(name, id_card_no)
values("Customer 2", NULL);

I get an error duplicated keys on the unique column.
In Oracle DB, unique columns are behaved a little different where multiple nulls are allowed in a unique column.

I know there are some tircks that you can do to allow multiple nulls in unique column in sql server(well, pretend to be) like creating a computed column, create a view and an index...

Are there any ways to archieve that in sql sever compact?

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UNIQUE Key Constarint Voilation In Sqlserver 2005

May 28, 2007





Hi,


I have created a table with 4 columns (SQL2005 server):

CREATE TABLE test(
userid smallint IDENTITY (1, 1) NOT NULL ,
name nvarchar (15) COLLATE Lithuanian_CI_AS NULL ,
empnumber nvarchar (14) COLLATE Lithuanian_CI_AS NULL,Description nvarchar (14) COLLATE Lithuanian_CI_AS NOT NULL
GO
ALTER TABLE test WITH NOCHECK ADD
CONSTRAINT PK_user PRIMARY KEY CLUSTERED (userid)
GO
ALTER TABLE test ADD
CONSTRAINT UK_user_name UNIQUE NONCLUSTERED (name),
CONSTRAINT UK_user_empnumber UNIQUE NONCLUSTERED (empnumber )
GO



The table has few records:

INSERT INTO test (name,Description ) VALUES ('laks','abcd')When I try to insert one more record with NULL value

INSERT INTO test (name,Description ) VALUES ('kusuma','hjjk')
GO
I get error message:

Error: Violation of UNIQUE KEY constraint 'UK_user_Name'. Cannot insert duplicate key in object 'user'. I want both(name and empnumber) coloumns to be unique and allow nulls.So how can i proceed further to achieve the same.Psl help me. ThanksKusuma

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Unique Constraint Doesn't Allow Multiple Null Values In Server?

Jun 2, 2014

Why we the Unique Constraint doesn't allow the multiple null values in Sql Server?

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Unable To Create Unique Constraint On A NULL Column

Apr 5, 2004

Hi all,

I am trying to add a unique index/constraint on a column that allows NULL values. The column does have NULL values and when I try to create a unique constraint, I get the following error.

CREATE UNIQUE INDEX terminated because a duplicate key was found for index ID 9. Most significant primary key is '<NULL>'.

Are'nt you allowed to create a UNIQUE constraint on a NULL column? Books Online says that you are allowed to create a unique constraint on NULL columns, then why am I getting this error.

Any help would be appreciated.
Thanks,
Amir

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Creating Index On A View To Prevent Multiple Not Null Values - Indexed View?

Jul 23, 2005

I am looking to create a constraint on a table that allows multiplenulls but all non-nulls must be unique.I found the following scripthttp://www.windowsitpro.com/Files/0.../Listing_01.txtthat works fine, but the following lineCREATE UNIQUE CLUSTERED INDEX idx1 ON v_multinulls(a)appears to use indexed views. I have run this on a version of SQLStandard edition and this line works fine. I was of the understandingthat you could only create indexed views on SQL Enterprise Edition?

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Multiple Columns Index/Key (does It Free Me From Creating A Single Column Indexes???)

Apr 12, 2007

I hope i'm in the right place, but thanks anyway....

Actually i have 2 questions (regarding sql-server Indices/Keys):



1) I have an index, which is consisted of 4 columns.

I've read elsewhere that this index functions (as well) as an index (single column

index) on the first column of this multi-column index.



Does this mean that if i'd like to have (in addition) Indices on all of the 4 columns

seperately i need to define only 3???



2) I have a unique key consisted of multiple columns.

I'd like to save an index to this combination of columns as well (to speed up

things in DB...).

Does the definition of a multiple-columns key free me from defining the multiple-

columns index???

can anyone explain the main diference between Keys and Indices???





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Multiple Columns Index/Key (does It Free Me From Creating A Single Column Indexes???)

Apr 16, 2007

I hope i'm in the right place, but thanks anyway....

Actually i have 2 questions (regarding sql-server Indices/Keys):



1) I have an index, which is consisted of 4 columns.

I've read elsewhere that this index functions (as well) as an index (single column

index) on the first column of this multi-column index.



Does this mean that if i'd like to have (in addition) Indices on all of the 4 columns

seperately i need to define only 3???



2) I have a unique key consisted of multiple columns.

I'd like to save an index to this combination of columns as well (to speed up

things in DB...).

Does the definition of a multiple-columns key free me from defining the multiple-

columns index???

can anyone explain the main diference between Keys and Indices???


thanks,

Ran Kizi

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Null/Unique

Aug 22, 2005

I'm sorry, I bet you get asked this ten times a day but I can't find the answer, In Access, you can make a field have a requirement for a unique entry, BUT it allows as many Nulls as you want (i.e. only check for Uniqueness if there is an entry).
How do you mimic this behaviour in SQL Server?

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Check Constarint Causing Problems

Apr 17, 2006

I have been having problems inserting data with dates.

If I do not use a constraint then the data is inserted without a problem but if the constraint is added I get this error.
Code:

"The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value"



What is the problem here?

I have the logins set to British English

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UNIQUE INDEX If Not NULL

Dec 17, 2006

Hello !

for MS SQL 2000
how can i set an unique index on Serial column but only if Serial IS NOT NULL

CREATE UNIQUE INDEX [IX_Product] ON [Product]([Serial]) ON [PRIMARY]

i can have 100 rows with a NULL Serial


thank you

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Indexes - Unique If Not Null?

Jul 19, 2007

Hi everyone

I have a varchar column which may, or may not, contain a userID value. I want some way of saying "If the column has a value, it must be unique" But I can't find any way of doing it without SQL complaining about duplicate null values. Is there a way of doing this?

Thanks!

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Unique Constraint And Null?

Feb 27, 2008



Can I create a unique constraint on a column that can contain null values?
I need the control of the non null values (must be unique)...null is Ok if there's more than one.
I tried creating a unique constraint but i'm getting the error (duplicate keys <null>)

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Creating A Unique Field

Nov 30, 2000

I have built a table called Visit_Fact, which is detailed medical data. Within this table I have to create several index fields.

Well one of the fields ([Diag Code]) that should be included will have null values.

Well in Access I was able to build my new field called IndKey which has the following SQL statement:

IndKey: [PracticeCode]&[Physician Code]&[Chart #]&[Visit #]&[InsCoNum]&[CPT]&[Modifier]&[Units]&[Diag Code]

1. Example data with Diag Code = null
ABCD1234ABCDEF1234567MEDI19921301

2. Example data with Diag Code <> null
ABCD1234ABCDEF1234567MEDI19921301708.1

This runs fine in Access and if the Diag Code is null, Access does not care, it still puts all the other information together. Such as the examples above.

Well I tried doing this in a Stored Procedure and when I ran across a record that had a null value for the [Diag Code] it made the IndKey field Null for that record. If it was not null then it looked like Example 2.

What is the proper way of creating my unique field in SQL Server?

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Creating A Unique Index

Jul 20, 2005

HiI tried the following from the help file...When you create or modify a unique index, you can set an option toignore duplicate keys. If this option is set and you attempt to createduplicate keys by adding or updating data that affects multiple rows(with the INSERT or UPDATE statement), the row that causes theduplicates is not added or, in the case of an update, discarded.For example, if you try to update "Smith" to "Jones" in a table where"Jones" already exists, you end up with one "Jones" and no "Smith" inthe resulting table. The original "Smith" row is lost because anUPDATE statement is actually a DELETE followed by an INSERT. "Smith"was deleted and the attempt to insert an additional "Jones" failed.The whole transaction cannot be rolled back because the purpose ofthis option is to allow a transaction in spite of the presence ofduplicates.But when I did it the original "Smith" row was not lost.I am doing something wrong or is the help file incorrect.Dan

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Creating A Unique Temp Table.

Jan 11, 2007

Set Quoted_Identifier On
Go
Set Ansi_Nulls On
Go

Alter Procedure spReport_SomeFooReport
@SearchFromThisDate datetime = null, @SearchToThisDate datetime = null

As
Declare @TableUniqueIdentifier varchar(80), @SQLString varchar(5000)

set @TableUniqueIdentifier = newid()
set @TableUniqueIdentifier = 'Report_SomeFooReport' + @TableUniqueIdentifier
set @TableUniqueIdentifier = replace(@TableUniqueIdentifier, '-', '7')
set @SQLString = 'Create Table ' + @TableUniqueIdentifier + ' (xxx varchar(40))'
exec @SQLString

Return
Go
Set Quoted_Identifier Off
Go
Set Ansi_Nulls On
Go


-------------------------------------------
the error is:
Server: Msg 2812, Level 16, State 62, Line 12
Could not find stored procedure 'Create Table Report_SomeFooReport06EEEC8D7EA6A74D0178EDD79E999B (xxx varchar(40))'.

So may'be a format issue or something,
im trying to create "temp" tables for sql 2005 report services in my Stored procedures which would have a sql job to get deleted at 23:00

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Unique Constraint Does Not Permit Duplicate NULL Values

Oct 2, 2000

After adding a Unique constraint to a database I cannot add more than one record with a null value for the constrained field. I've tried both adding the constraint to an empty table as well as a table with multiple null values already in the subject field; both efforts have failed.

According to BOL SQL-7 allows Unique Constraints on fields with Null values. Am I missing a step? I do need to allow nulls in the field yet ensure that when there is a non-null value it is unique.

The SQL statement I've used is: ALTER TABLE tbl_MasterUIC ADD CONSTRAINT uniquesamplenbr UNIQUE NONCLUSTERED (samplenbr)

Thanks for any and all suggestions

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SQL 2012 :: Creating A Unique ID For Groups Of Rows?

Mar 20, 2015

We have a sorted data that looks like the first 3 columns below, and fourth colum is what I want to create)

Shift_start meal_break shift_endShift ID
1 0 0 1
0 0 0 1
0 0 1 1

1 0 0 2
0 0 0 2
0 0 1 2

I need to find a method to assign unique Shift IDS to rows that correspond to a single shift. For instance, the first shift would begin on the first row when shift_start flag is turned on, and end on the third row when shift_end flag is turned on.

Can I do this in SQL ?...some kind of grouping ?

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Error Number For Duplicate Column Value During An Insert For A Unique Column ?

Jul 27, 2007

I have a table in which a non-primary key column has a unique index on it.
If I am inserting a record into this table with a duplicate column value for the indexed column, then what will be the error number of the error in above scenario? OR How could I find this out?
 

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Transact SQL :: Find Unique Rows In Column That Are Associated With Another Field In Another Column?

May 1, 2015

I am having issues trying to write a query that would provide me the unique GUID numbers associated with a distinct PID if the unique GUID's > 1.  To summarize, I need a query that just shows which PID's have more than one unique GUID. A PID could have multiple GUID's that are the same, I'm looking for the PID's that have multiple GUID's that are different/unique. 

Table1

GUID PID
GUID1 PID1
GUID1 PID1
GUID1 PID1
GUID2 PID1
GUID3 PID2
GUID3 PID2
GUID3 PID2

The result of the query would only have PID1 because it has two unique GUID's. PID2 would not be listed has it has the same GUID3 in each row.

Result:

PID1 

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Transact SQL :: Creating A View Using DISTINCT And Not Getting Unique Results?

Sep 21, 2015

I am building a view to be used to drill down into a Lightswitch app I'm building and to drive this I want to use a view based off the selection of that value several other values will be given to the user to choose from related to the first selection. I've created a view using the following statement:

SELECT DISTINCT TOP (100) PERCENT ARSFamily, ARS_Index
FROM dbo.csr_standards_cmsars
ORDER BY ARSFamily

 but the results come back with ALL the records of the source table (509 rows) when there should have only been 29 rows returned (the appropriate number of families or unique groups).  The index is necessary to have Lightswitch use the view as a data source.what I'm doing wrong here?

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Creating A Database From Multiple Databases Accross Multiple Servers

Sep 13, 2007

Hi,

I'm trying to create a database that takes specific information from a number of databases on different servers to make some reporting that we have much easier.

I'm pretty new to SQL so I'm not sure of the best way to proceed. I read an article that suggested I use the OPENROWSET command. The problem is, the version of SQL that came with one of the programmes we use is limited and will not allow you to turn on the allow "Ad Hoc distributed Queries" so the SLQ statement will not execute.

I'm confused why it won't let me to connect through ODBC as I've created a web page that selects data from this database with no problems!

Here is the SQL statement that I've written to make sure it is the correct one (on the msdn library page it said that this was the ODBC connection):

SELECT a.*
FROM OPENROWSET('MSDASQL','DRIVER=(SQL Server);SERVER=APPOLOACT7;UID=sa;PWD=***************',
'SELECT * FROM MDCTestAndDev.dbo.TBL_CONTACT') AS a



I've also created the ODBC connection using the tool on Administration Tools>Data Sources ODBC

Any help would be greatly appreciated (also any ways of selecting from one database and inserting it into another will be helpfull)

Thanks

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SQL Server 2008 :: Creating Index - Add Unique Key That Will Cover 3 Fields

Sep 30, 2015

Table Name: Denominator
Already has the following constraint:
PK_Denominatorclustered, unique, primary key located on PRIMARY DenominatorID

How can I add a unique key that will cover the 3 fields --> MemberID,MeasureID,TimePeriodID

I also want to know whether we can include the " WITH ( IGNORE_DUP_KEY=ON ) "

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Cannot Insert The Value NULL Into Column 'OrderID' -- BUT IT IS NOT NULL!

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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May 13, 2015

It's giving me an error while I'm trying to change column value from not null to null..

'tblid' table
- Unable to modify table.  

Cannot insert the value NULL into column 'ValidID', table 'Xe01.dbo.Tmp_tblid'; column does not allow nulls. INSERT fails.

The statement has been terminated.

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-- Ryan

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Jul 10, 2001

Hi,

I have 3 columns that I'd like to set as a key, however I do have multiple instances of NULLs for all 3 columns. Thus when I try to create the key, it stops because there are multiple instances of NULLs. I looked at using procedure that check each entry made into the table, but I couldn't figure out how to deny an INSERT/UPDATE request. Anyone have any better methods of implimenting the unique key?

Ilya

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Jul 16, 2006

Hi,
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Jun 10, 2008

Please see below post

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Sep 5, 2006

hello guys,

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thank you.

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