The Records With Null Value
Oct 15, 2007
Hello,
I have a column called Prod_Class in a table. The data type is char(1) and allow null. The records have 3 distinct values ('E', 'P' and null) for Prod_Class in this table . When I run Select * from table1 where Prod_Class <> 'E', I expect I get the records that value equals to 'P' or is null. However, I only got records that the value equals to 'P'. If I run "Select * from table where Prod_Class <>'E' and Prod_Class <> 'P'", I got nothing while I expect I get the records that value is null. I know if I run "Select * from table where Prod_Class is null", I can get the records that value is null, but I need to know why I can not get result using "<>" and how to fix it. I am using SQL server 2005.
Thanks in advance for your help!
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Oct 19, 2006
Hi, I am trying to use a formView with an update button to update individual records in an sql database. (when i click update it doesnt perform the update and just refreshes the page. ) One of the fields in my records is a NULL - this is also one of the fields that i need to update. When i manually go into the database and enter some data, and then go back to my form, it updates fine, but as soon as i delete the data from the field, it returns to NULL and im back to square one. Any Ideas on how to get around this problem?THanks
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Oct 9, 2007
I'm hoping someone can help me with my problem.
I'm reading in records from a 'flat file' and loading them into sql.
I have 5 values I'm loading in. I first check my sql db, if all 5 values match a current record in sql, I don't want to load the record, because it's already there. If it doesn't exist, I need to load it.
It works fine as long as none of my values are NULL. But if I have a record with a field, say Gender, that is null, if its a new record it loads fine, setting gender to NULL in sql. But then when I encounter another record, which is identical, I'm testing to see if it already exists by doing a 'select where Gender = @Gender' and it always returns that the record does not exist in the db - even though it exists (because its using the = instead of is null)!
I need some mechanism where if the value is null it tests 'Gender is null' but if there is a value, it tests gender=gender, [and I need this for all my parameters]. Or is there some other way to do this?
Here is my code for looking to see if the record exists:
public static int ExistInsured(int CaseID, object InsuredLastName, object DateOfBirth, object CurrentAge, object Gender)
{SqlConnection conn = new SqlConnection(connStng.ToString());
SqlCommand cmd = new SqlCommand("SELECT top 1 InsuredID from Insured Where PolicyID = (Select PolicyID from Policy where CaseID = @CaseID) and LastName = @InsuredLastName and DateofBirth = @DateofBirth and Gender = @Gender", conn);
int result = -1;
cmd.CommandType = CommandType.Text;cmd.Parameters.AddWithValue("@CaseID", CaseID);
cmd.Parameters.AddWithValue("@InsuredLastName", InsuredLastName);cmd.Parameters.AddWithValue("@DateOfBirth", DateOfBirth);
cmd.Parameters.AddWithValue("@CurrentAge", CurrentAge);
cmd.Parameters.AddWithValue("@Gender", Gender);
conn.Open();
try
{object ret = cmd.ExecuteScalar();
if ((ret != null) && (ret is int))result = (int)ret;
}
finally
{
conn.Close();
}return result;
}
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Feb 9, 2008
Hi,
All records of a table must be deleted if a field (field1) contains NULL or is made empty by a previous update command.
I did this but it only works when the field is made empty, not when it contains NULL:
dim field1 as string = ""...sql = "delete from mytable WHERE (field1=@field1)" comd = New SqlCommand(sql, oConnection) comd.Parameters.AddWithValue("@field1", field1) comd.ExecuteNonQuery()
How can i do that?
Thanks
Tartuffe
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Aug 27, 2005
hello friends!
i am new to sql and practicing on query analyzer
here is the practice table(test) i have ...
id | names| skill | city|
101| roy | welder | yuba|
102| peter | NULL | yuba|
103| alex | plumber | yuba |
104| edward | NULL | yuba|
105| smith | carpenter| yuba|
Now my problem is i want to see only those records which has skill = NULL..
I tried this stupid query ...
select * from test where skill = NULL
with this it is only showing me all the columns of my table
is there any query for my problem??
also
Is there any single query in query analyzer with which i can delete all the records having skill = NULL ?
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Aug 29, 2006
Hi -- I'm starting an ASP.NET 2.0 application which contains a page with a checkbox and gridview control on it. In its default state the gridview displays all the records from a table pulled from a SQL Server database (via a SqlDataSource object). When the user checks the checkbox, I want the gridview to display only the records where one of the columns is not null. But I've been unable to construct the WHERE clause of the SQLDataSource object correctly. I see that I can hard-code the SqlDataSource object so that the column to be filtered is always NULL or always NOT NULL. But I want this filtering to be more dynamic such that the decision to show all or non-null records happens at run-time. Should I be using two SqlDataSource objects -- one for the NOT NULL condition and one for the "all records" condition? Then when the user checks the checkbox, the gridview would be configured to point to the appropriate SqlDataSource object. (???) Seems like a bit of overhead with that approach. I'm hoping there's a more elegant way to get this done. Please let me know if you need more information. Thanks in advance. Bill
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Feb 11, 2014
I have written up a grid consisting of properties and units.The way it works is we have properties, and within properties there are units. They are two seperate tables.Some properties do not have any units so in the unit reference (UN_UREF) column for those records which do not have units and are NULL I would like to insert the text 'NO UNIT'.Please see below for my SQL for the grid which works fine.
create or replace view VWC_PROPMKUNIT_TEST AS ( SELECT
PR_SNAM, PR_NAME, PR_ADD1, PR_ADD2, PR_ADD3, PR_ADD4, PR_ADD5, PR_ADD6,
PR_POST, PR_OWN, UN_UREF, UN_NAME, UN_GFA
FROM PROP
LEFT JOIN UNIT
ON PR_SNAM=UN_BREF);
All I need to do now is insert 'NO UNIT' within the Unit Reference column where it is NULL.
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Dec 5, 2007
How to pull null (empty) records from SQL database,
what query am I suppose to use to get result
help me
thank you
maxs
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May 14, 2008
Hi,
I'm running into an issue where if a report retrieves 0 records, I run into an error. My report has 2 queries-- the main query to retrieve Account information and the other to return Contact information based on the contact id(s) returned by the Account query. The reason needing two separate queries is that the contact and account tables are on different databases.
Now here is my account query: select contact_id, username, password from account.
My contact query looks like this: select name, address, .... from contact where contact_id = @contact_id.
In my report parameters, I define contact_id like this:
*******************************************
name = contact_id
data type = integer
prompt = [blanked out]
hidden = checked
internal = checked
multi-value = unchecked
allow null value = checked
allow blank value = unchecked
available values:
from query: dataset = account
value field = contact_id
label field = contact_id
default values:
from query: dataset = account
value field = contact_id
**********************************************
Now, when I run my report and knowing there are no records, I get the following error: "The 'contact_id' parameter is missing a value". Any ideas on how to solve this issue? Thanks.
larry
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Jan 10, 2008
Can someone helo me to query a table and list all the columns and how many null records are there in each.
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Nov 10, 2014
I recently ran into an issue with an issue with a query against our Data Warehouse. When attempting to sum revenue from a table, and using a WHERE clause on a field that contains NULL values, the records with the NULL values are suppressed (in addition to whatever the WHERE clause specified). I believe this is because a NULL value is unknown so SQL doesn't know if it does or doesn't fit the criteria of there WHERE clause so it is suppressed.
That being said, is there a way to avoid this instead of having to add an ISNULL function in the WHERE clause which is going to kill performance?
Code:
create table #nullTest (
name varchar(50)
,revenue int)
INSERT INTO #nullTest
Values ('Tim',100)
,('Andrew', 50)
,(null, 200)
SELECT sum(revenue) as Revenue FROM #nulltest WHERE name <> 'tim'
Ideally, I would want the SELECT statement above to return 250, not 50. The only way I can think to accomplish this is with this query:
Code:
SELECT sum(revenue) as Revenue FROM #nullTest WHERE isnull(name,'') <> 'tim'
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Apr 11, 2014
I'm trying to insert multiple records, each containing a null value for one of the fields, but not having much luck. This is the code I'm using:
Use InternationalTrade
Go
CREATE TABLE dbo.ACCTING_ADJUST
(
stlmnt_instr_id varchar(20) null,
instr_id varchar(20) not null,
[Code] ....
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Jun 9, 2015
I'm trying to get the records in table1 not in table2 the query is
Select * from table1 where not exists (select * from table2)
--table1 and table2 ,structure are same
It will get a null result
Strange thing , while I add a where condition in the subquery, it worked.
Select * from table1 where not exists (select * from table2 where table1.ID =table2.ID)
It will get the result as expected.
I just thought it would compare all the fileds for the outer query and inner query, but seems not. Why, I add a condition, it worked ?
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Mar 3, 2008
Hi all I am having some issues in selecting items from my database where the record is NOT NULL. I have the code below however although some fields do contain soem data in it, others are blank which I believe are empty spaces. How do I do a SELECT command which ignores empty spaces and NULLS?
Code Snippet
SELECT CustomSearch FROM OfficesTable WHERE CustomSearch IS NOT NULL
Thanks, Onam.
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Apr 4, 2007
Does SQL have a function that return "null" for records which don't exist? Per example in a FK relation ship, that not all records in the first table have a "child" in the second table, so it returns null records.
Thank you very much.
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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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Jan 21, 2008
I'm using an ObjectDataSource in Visual Studio to retrieve records from a SQL Server 2005 database.
I have a very simple dilemma. In a table I have fields FirstName, Surname, Address1, Address2, Address3 etc. None of these are mandatory fields.
It is quite common for the user not to enter data in Address2, Address3, so the values are <null> in the SQL table.
In Visual Studio 2005 I have an aspx form where users can pass search parameters to the ObjectDataSource and the results are returned according to the passed in parameters.
The WHERE clause in my Table Adapter is:WHERE (Address1 LIKE @Address1 + '%') AND (Address2 LIKE @Address2 + '%') AND (Address3 LIKE @Address3 + '%') AND (FirstName LIKE @FirstName + '%') AND (Surname LIKE @Surname + '%')
If, for example, I simply want to search WHERE FirstName LIKE ‘R’, this does not return any results if the value of Address3 is <null>
My query is this: Could someone please show me the best way in Visual Studio 2005 to return records even if one of the Address fields is <null>.
For reference, I have tried: Address3 LIKE @Address3 + '%' OR IS NULLThis does work, however itsimply returns every instance where Address3 is <null> (accounting for about 95% of the records in the database). Thanks in advance Simon
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Mar 20, 2014
writing the query for the following, I need to collapse the continuity. If the termdate for an ID is one day less than the effdate of the next id (for the same ID) i need to collapse the records. See below example .....how should i write the query which will give me the desired output. i.e., get min(effdate) and max(termdate) if termdate is one day less than the effdate of next record.
ID effdate termdate
556868 1999-01-01 1999-06-30
556868 1999-07-01 1999-10-31
556869 2002-10-01 2004-01-31
556872 1999-02-01 2000-08-31
556872 2000-11-01 2004-01-31
556872 2004-02-01 2004-02-29
output should be ......
ID effdate termdate
556868 1999-01-01 1999-10-31
556869 2002-10-01 2004-01-31
556872 1999-02-01 2000-08-31
556872 2000-11-01 2004-02-29
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Oct 20, 2015
In my report i have CNAME parameter , which allows null value. I checked Allow null value check box in report parameter properties.
when i preview the report , it displays checked NULL check box beside CNAME parameter . I want to give some meaningful name(i.e.ALLCustomers) to this checkbox instead of NULL.
Is it possible through SSRS designer?
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Jul 15, 2015
I have a flat file with the following columns
SampleID Rep_Number Product Protein Fat Solids
In the flat file SampleID and Product are populated in the first row only, rest of the rows only have values for Rep_Number, Protein, Fat, Solids.
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
I have a report that is run on a monthly basis with a default date of null. The stored procedure determines the month-end date that it should use should it be sent a null date.
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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Mar 26, 2007
Looks like there was a fix and then I read this fix is not a fix. Does anyone know how this can be rectified? Does it mean that only Windows authentiation is the only way it works. The Software is over 2 years old, there are no excuses.
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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
I would drop and add the table but the data can't be deleted. So if anyone could help with the statement it would be greatly appreciated. Thanks
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Feb 26, 2004
I'm trying to set the concat... option to OFF
all the time and in all my databases
I tried this command
USE master
EXEC sp_dboption 'DatabaseName', 'concat null yields null', 'FALSE'
but it doesn't change anything
Select NULL + 'TOTO'
----> NULL
(it should be 'TOTO')
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Aug 3, 2005
hi,my structure table in database:Amount float(53) not null default 0when i try to run his script:alter table ABC alter column Amount float(53) nullit can only set the Amount to allow null, but can't set the defaultvalue to empty.anyone know how to set the field to allow null and default set toempty, no value.thanks
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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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May 3, 2006
Hello.
I've built a sample CLR function with the following declaration....
CREATE FUNCTION GetManager(@DeptCode nvarchar(3))
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
We have a case where in we should show date based on conditions for e.g if we had a column defined as
col varchar(10) then we would show col as 'NULL' for some condition and actual value when no condition
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 ?
How can we show database null for the case condition instead of string "null"?
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Nov 27, 2000
I have two columns A (which allows nulls) and B( which does not allow nulls).
How can I add the contents of columns A and B SO THAT I DO NOT GET A NULL RESULT WHEN A IS NULL.
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
Does not reproduce this problem (and so is a probable fix) but the questions remains, what causes this?
TIA,
Karl.
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Aug 2, 2015
I have 595 default constraints in my database. I can return a list of them using the following:
select * from sys.default_constraints
Is there a way I can return a list of just the ones where NULL is still allowed? I want to update all of the columns with a default value to not allow NULLs.
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