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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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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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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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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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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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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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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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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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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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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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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Jan 25, 2008

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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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Oct 31, 2005

Can you create a unique constraint on multiple columns, or does it haveto be implemented as a unique index?If possible can someone please post some sample code?Thanks,

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Sep 5, 2006

hello guys,

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thank you.

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Apr 27, 2007

Dear folks,
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Vinod

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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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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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T-SQL (SS2K8) :: Cannot Define Primary Key Constraint On Nullable Column But Column Not Null

Sep 30, 2014

We have a database where many tables have a field that has to be lengthened. In some cases this is a primary key or part of a primary key. The table in question is:-

/****** Object: Table [dbo].[DTb_HWSQueueMonthEnd] Script Date: 09/25/2014 14:05:09 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[DTb_HWSQueueMonthEnd](

[Code] ....

The script I am using is

DECLARE@Column varchar(100)--The name of the column to change
DECLARE@size varchar(5)--The new size of the column
DECLARE @TSQL varchar(255)--Contains the code to be executed
DECLARE @Object varchar(50)--Holds the name of the table
DECLARE @dropc varchar(255)-- Drop constraint script

[Code] ....

When I the the script I get the error message Could not create constraint. See previous errors.

Looking at the strings I build

ALTER TABLE [dbo].[DTb_HWSQueueMonthEnd] DROP CONSTRAINT PK_DTb_HWSQueueMonthEnd
ALTER TABLE [dbo].[DTb_HWSQueueMonthEnd] Alter Column [Patient System Number] varchar(10)
ALTER TABLE [dbo].[DTb_HWSQueueMonthEnd] ADD CONSTRAINT PK_DTb_HWSQueueMonthEnd PRIMARY KEY NONCLUSTERED ([Patient System Number] ASC,[Episode Number] ASC,[CensusDate] ASC)
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

They all seem fine except the last one which returns the error

Msg 8111, Level 16, State 1, Line 1
Cannot define PRIMARY KEY constraint on nullable column in table 'DTb_HWSQueueMonthEnd'.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.

None of the fields I try to create the key on are nullable.

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May 3, 2007

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Jan 19, 2008

Hello, I will explain myself further. I want to make my table in such a way that no two colums have the same value for example:
Row 1 - Column 1 = "cool"
Row 1 - Column 3 = 91
Row 3 - Column 1 = "cool"
Row 3 - Column 3 = 91
 
I dont care about one column having duplicate values, I want to protect against  Column 1 and 3 having the same values on other rows. Is this possible to do in sql server?

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Re-populate A Unique Number Into Multiple Fields

Oct 14, 2004

What I need to do is re-populate a unique number into multiple fields,

Let me explain, An employee can appear in the first table only once but can be in the second table multiple times with multiple employee numbers .There is a field called TFN that is unique and we are using it to create a unique id called KRid so what I have done is created 2 tables namely TEST_TBL and TEST2_TBL . In TEST_TBL I am populating a KRid with a unique no being produced by the TFN field only once i.e 12345 being the resulting unique id number. If an employee has 2 employee numbers i.e empno 1 and empno 1000,only employee no 1 will have the unique KRid created but nothing for 1000 because the record already exists , so what has me stumped is that the TFN for employee empno 1 and the TFN for empno 1000 are the same. How do I get the KRid (12345 from empno 1) to populate empno 1000 in TEST2_TBL , The second table has all records in so I can group the second table by TFN id but how do I populate employee 1000 in the second table with the KRid 12345.


Please help!!!!! Below are how the tables are set up and an example of the result.

TABLE 1

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[TEST_TBL]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[TEST_TBL]
GO

CREATE TABLE [dbo].[TEST_TBL] (
[Empl_Num] [char] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Surname] [char] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[First_Name] [char] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Mid_Name] [char] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Hours_Day] [numeric](18, 2) NULL ,
[Hours_Wk] [numeric](18, 2) NULL ,
[KR_ID] [bigint] IDENTITY (1, 1) NOT NULL ,
[TFN] [char] (32) COLLATE Latin1_General_CI_AS NULL ,
[Date_Term] [datetime] NULL ,
[Empl_Type] [int] NULL ,
[Cost_Centre] [char] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Empl_Status] [int] NULL
) ON [PRIMARY]
GO

TABLE 2

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[TEST2_TBL]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[TEST2_TBL]
GO

CREATE TABLE [dbo].[TEST2_TBL] (
[EmpNumber] [char] (32) COLLATE Latin1_General_CI_AS NULL ,
[TFN] [char] (32) COLLATE Latin1_General_CI_AS NULL ,
[KR_ID] [char] (10) COLLATE Latin1_General_CI_AS NULL ,
[EmpStatus] [int] NULL ,
[EmpType] [int] NULL ,
[CommonName] [char] (32) COLLATE Latin1_General_CI_AS NULL
) ON [PRIMARY]
GO

Query goes as follows for table 1:

SELECT NPE000.EmpNumber, NPET00.RecordStatus, NPE000.KR_ID, NPE000.Surname, NPE000.FirstName, NPE000.SecondName, NPE000.Class, NPE000.DateEmployed, NPE000.DateOfBirth, NPE000.HoursPerDay, NPE000.HoursPerWeek, NPE000.PassportNo, NPE000.AwardCode, NPE000.EmailPayslipTo, NPE000.Location, NPE000.Grade, NPE000.DateTerminated, NPE000.EmploymentType, NPE000.DistCode, NPE000.EmpStatus, NPET00.TaxRefNo FROM NPE000 NPE000, NPET00 NPET00 WHERE NPET00.RecordStatus = 0 and NPET00.TaxRefNo <> ' 111111111' and NPET00.TaxRefNo <> ' 000000000' AND LENGTH(NPET00.TaxRefNo) >= 9 AND LENGTH(NPE000.KR_ID) >= 0 AND NPE000.EmpNumber = NPET00.EmpNumber


Query goes as follows for table 2:

SELECT NPE000.EmpNumber, NPE000.FirstName, NPE000.Surname, NPE000.Class, NPE000.Location, NPE000.EmploymentType, NPE000.EmpStatus, NPET00.TaxRefNo, NPE000.Paypoint, NPE000.KR_ID, FROM NPE000, NPET00 WHERE Recordstatus = 0 and (EmploymentType = 1 AND EmpStatus = 1 AND NPE000.EmpNumber = NPET00.EmpNumber


From this you can see that in table 1 it will only create 1 KR_ID for only one employee number but in table 2 I am bringing through all employee records. In table 2 I can group by NPET00.TaxRefNo which will bring all NPET00.TaxRefNo's togeather. From that I would like to populate the other employee numbers with the unique KR_ID.

Example:Table 1

000001,Jackson,James,Sam,7.6,38,12345,475431212


Example:Table 2

000001,Jackson,James,Sam,7.6,38,12345,475431212
001000,Jackson,James,Sam,7.6,38,,475431212

I hope this helps

Thanks in advance

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Query On Unique Records With Multiple Criteria

Oct 19, 2013

I'm fairly new in SQL. Been trying for months to create the right script for this particular case but still cannot give me 100% result as required.

SCENARIO :

I am required to query from 2 tables for those unique record that meets both conditions below:-
1. Status is 1 @ max (trans_id), paychnl = CC
2. Status is 2 @ max (trans_id), paychnl = A or B

FYR, 2 tables and respective columns to query are as below:-
table PTFF --> col ID, TRANS_ID,TRANSDATE,EFFDATE,TRANSCODE
table CHFF --> col STATUS,PAYCHNL

FYI, status refers to the paychnl method status:-
==> 1 means the current paychnl method
==> 2 means the previous paychnl method

paychnl method can be multiple because it will be defined as 2 for all the histories' paychnl chosen earlier, but 1 should only be unique as it is the latest paychnl chosen for each unique ID. however, it may appear more than once when it's taking those in earlier TRANSDATE, so here we would need the max trans_id as it will show the latest updated TRANSDATE.

Apart from that, I need only those most recent paychnl to be A or B and the latest paychnl is CC so, this been indicated by the same max trans_id for the same ID.

Aft trying so many times on this MAX command but failed to get any result, I only managed to come up to this part only. please refer below:-

table PTFF --> col ID, TRANS_ID,TRANSDATE,EFFDATE,TRANSCODE
table CHFF --> col STATUS,PAYCHNL

SELECT DISTINCT PTFF.TRANSCODE,PTFF.ID,PTFF.TRANS_ID,PTFF.TRANSDATE,PTFF.EFFDATE, CHFF.STATUS,CHFF.PAYCHNL

FROM DBO.PTFF PTFF
JOIN DBO.CHFF CHFF
ON CHFF.ID = PTFF.ID
WHERE
PTFF.TRANSDATE BETWEEN 130501 AND 130831
AND PTFF.TRANSCODE='T522'
AND (CHFF.STATUS=1 AND CHFF.PAYCHNL='CC' OR (CHFF.STATUS=2 AND (CHFF.PAYCHNL='A' OR CHFF.PAYCHNL='B')))

However, the script above returns :-

1. All those records with STATUS 1 regardless paychnl is A or B in most recent status 2,
2. Expected results also appear ==> 1 same ID with status 1 while paychnl=CC and status 2 while paychnl=A or B
3. Also duplicates of expected results but for different TRANSDATE and not at MAX TRANS_ID

Samples of the result:-

IDSTATUSTRANS_IDPAYCHNLTRANSDATEEFFDATETRANSCODE
51881712CC13082920130920T522
9361164CC13081620140813T522
78531153CC13082020130814T522
8949151CC13081220130801T522
8949251B13081220130801T522
19081455CC13051620131129T522
19082455A13051620131129T522
19081409CC11101920111129T522
19082409A11101920111129T522
19081404CC11092920111129T522
19082404B11092920111129T522

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I'm new to MS SQL and VB. I have a table with one field JOB_NAME containing 20 records. Out of that field I want to retrieve 6 of the 20 records into a pulldown menu. They are all unique text names like so:

Anna Smith
John Doe

etc. I did not see IDs listed for any of the names in the table when I looked.

There is no common denominator to the names that can be filtered in the SELECT statement, and the 6 that I want will need to be pulled out individually.

Is there a way to do this with a SELECT statement? I have not found much information about how to extract unique records out of a single field. Here's the statement I'm using which pulls all of them:

strSQL = "SELECT DISTINCT JOB_NAME AS Names FROM [WORKER_NAMES] WHERE JOB_NAME<>' ' ORDER BY JOB_NAME ASC"

This gives me the total list but I only want to bring back 6 of the 20 for the pulldown.

Is there a way to modify this statement to pull only the records that I want?

Thanks for any help you can give.

AJ

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