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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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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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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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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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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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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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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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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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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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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Jul 23, 2005
Hello everyone, I am new to ERWIN and I need helps from the experts outthere.We are using ERWin 4.1.2771 and have reversed engineered some MS SQLServer 2000 databases.The problem we are having is that we have a FK on a column to a tablewhere the PK of the referencing table is on another column (such as anidentity column). We have a unique index on the column in the PK tableand SQL Server allows you to build a FK reference even though thecolumn is not defined as the PK.Does anyone know how to create this type of FK within Erwin?Thank You
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Jan 25, 2008
I have a pivot transform that pivots a batch type. After the pivot, each batch type has its own row with null values for the other batch types that were pivoted. I want to group two fields and max() the remaining batch types so that the multiple rows are displayed on one row. I tried using the aggregate transform, but since the batch type field is a string, the max() function fails in the package. Is there another transform or can I use the aggragate transform another way so that the max() will work on a string?
-- 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,
I have a non-cluster index on the filed, I need to make it non-cluster index and unique which allows multiple nulls, how should I do this with an sql statement?
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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,
I have one table which is using to keep 10 difference type of serial number (that mean i got 10 column in the table). Is there any way to do unique key checking (individually, not combine) on these 10 serial number without sacrify the performance?
thank you.
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Apr 27, 2007
Dear folks,
please tell me the query for altering a column from not null to null
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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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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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
I receive this message when I try to run any report. The reportserver and reportservertempdb databases were upgraded using backup/restore from SQL2000 to SQL2005 on a separate server which is running RS2005 . Please help. Thanks
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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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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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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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Apr 22, 2006
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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Feb 3, 2008
I am looking for advice on how to handle the following situation.Data being saved to a database table. Unique index on column in table. If the constraint is violated, what is the best way in alerting the user? Catch the exception and display error message to user? How do I know the exception is because of a unique index violation?
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Jul 11, 2004
Hi,
How can I assign or retrieve a unique ID from a msSQL table where there isn't a unique column.
Is there a hidden 'raw id' i can retrieve from msSQL for each record?
I'm not allowed to change the current database at all, but the developers who created it managed to use it without Unique IDs.... which doesn't help me coming from a mySQL background where UID's are kind of mandatory.
Thanks
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Jan 15, 2015
I have a After insert, update trigger. When I update multiple records with unique constraints column in it update fails. But if this a single record update it works.
Could like to know the reason.
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