Check For Null Values In Transact Sql
Aug 20, 2006
I am using Visual Web Developer Express 2005 and SQL Server Express 2005.
I have set up a trigger that fires when an update has been performed on
a specific table. The trigger checks to see if specific columns have
been updated. If they have, then the trigger code is executed. This part
works fine.
I am now trying to find a way to check if null values exist in either
one of two field from the same table. If either field contains a null
value, then I don't want the trigger code to be executed.
How can I check for null values and skip a block of code within my
Transact Sql trigger.
Thanks.....
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Jan 19, 2007
How can I check on NULL values in a Select statement?
SELECT ID FROM TabelWHERE somecolumn <> NULL??
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Aug 5, 2015
I have a table that keeps track of all changes that were performed in an application. There is a column called "old value" and column called "new value". There are some values in the application that don't require data therefore the "old value" or "new value" values can be empty. These columns are an nvarchar data type because the value can be text or numbers or dates. An example is "ReceivedDate". There is a report that is generated based on this table.
What is happening is the query in the report dataset is adding dates when it should be displaying empty. They query is using "CASE/WHEN/THEN". What I need is "When the column is "RecievedDate" and it is not null then convert it to a date". This is for formatting purposes.
This is an example of the table:
UpdateColumn
Old Value
New Value
ReceivedDate
7/8/2015 5:00:00 AM
ReceivedDate
7/8/2015 12:00:00 AM
7/9/2015 5:00:00 AM
ReceivedDate
7/9/2015 12:00:00 AM
So, the first time it was updated there was no value but it was replaced with July 8, 2015 and so on.This is what the report is displaying
This is the query:
CASE UpdateColumn
... WHEN 'ReceivedDate' THEN (replace(convert(varchar(11),CONVERT ( date, oldvalue ), 106), ' ', '-') )
...
I tried adding
CASE UpdateColumn
...
WHEN 'ReceivedDate' IS NOT NULL
THEN (replace(convert(varchar(11),CONVERT ( date, oldvalue ), 106), ' ', '-') )
...
But it did not like the "IS NOT NULL".
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Mar 13, 2014
I am using the below query to calculate column values. But I need to return zero when a column values is empty or null.
select [Funding] [Fundings],
[Original] AS [Originals],
[Variance] = SUM([Previous_Year]-[Current_Year]),
[SumValue] = SUM([CurrentYear]/4),
[ActualValue] = SUM([Variance] * 0.75),
[FinanceYear],
[New Value] = SUM([Previous_Year]+[Current_Year])
from Finance
GROUP BY [Original], [FinanceYear]
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Mar 28, 2014
select '$ '+ CONVERT(varchar,CONVERT(decimal(10,0),CONVERT(money, Amt_Value)),1) as [Amount]
from Products
How can I sum this column values and need to set a validation like the column has null values it has to return zero.
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Oct 19, 2015
how to do a check for 2 columns. As long as there is data for at least one of the columns I want to return rows.
Example Data
create table test
(
ID int,
set1 varchar(50),
set2 varchar(50),
[code]....
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Jun 23, 2015
i want to display the max Date in place of NULL when Indicator is "1"
INPUT
Emp Num
Date
Indicator
1
Null
1
[code]....
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Sep 25, 2015
I have tried all possible combinations of changing this. But was not able to make the results tally.I am giving you a part of the query, there are others queries involving 4 tables which are based on this same temporary table query.
SELECT c.juris_id, b.jrnl_mo_yr
FROM a_trueup a,
#t_mths b, r_rj c
WHERE a.rlzd_mo_yr
=* b.jrnl_mo_yr
AND
a.juris_id
=* c.juris_id
[code]....
I tried using left outer join as mentioned in blogs but got a different result (14 rows).I also used set null off/on options but no luck ..
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Jun 15, 2015
I'm running the following test query on a single table:
SELECT sph.datestamp, sph.stocksymbol, sph.closing, DATENAME(dw, sph.datestamp),
CASE DATENAME(dw, sph.datestamp)
WHEN 'Monday' then 'Monday'
ELSE (SELECT CAST(sph2.datestamp AS nvarchar) FROM BI_Test.dbo.StockDB AS sph2 WHERE sph2.DateStamp = DATEADD(d, -1, sph.datestamp) AND sph2.StockSymbol = 'NYA')
END AS TestCase,
[Code] ....
And here's an example of the output I'm getting:
Why the exact same subquery in the THEN of the second CASE statement is returning NULL when the first one completes as expected?
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Jun 29, 2015
I have tables and a function as representated by the code below. The names for objects here are just for representation and not the actual names of objects. Table RDTEST may have one or multiple values for RD for each PID. So the function GIVERD will return one or multiple values of RD for each value of PID passed to it.
When I run the following query, I get the required result except the rows for CID 500 for which PID is NULL in table T1. I want the rows for CID 500 as well with PID values as NULL.
SELECT A.CID,
A.ANI,
A.PID,
B.RD
FROM T1 AS A CROSS APPLY GIVERD(A.PID) B
CREATE TABLE [DBO].[RDTEST](
[PID] [INT] NULL,
[RD] [INT] NULL
)
[Code] ....
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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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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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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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Mar 22, 2006
hi,
it is my first post on this forum, please be patient if i miss any important bit of information.
i am transporting data from a legacy system into mssql 2k5 using SSIS.
among those column of a dataset there are 13 columns, all necessary for operational reasons, that i need to ensure data consistance.
i believe i could do this check using the lookup data flow item, but surely there must be a way to do it in a more streamlined fashion.
since column names contain numbers to distinguish the version, eg; col01, col02, col03 .. col13.
i thought i could include the lookup within a loop and use a couple of variables to do this trick, but since i have not done it before i am asking for some sort of guidance from a guru among you folks.
please let me know if further clarification is necessary.
regards,
nicolas
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Feb 23, 2007
I have a DTSX package which reads values from a fixed-length text file using a data reader and writes some of the column values from the file to an Oracle table. We have used this DTSX several times without incident but recently the process started inserting NULL values for some of the columns when there was a valid value in the source file. If we extract some of the rows from the source file into a smaller file (i.e 10 rows which incorrectly returned NULLs) and run them through the same package they write the correct values to the table, but running the complete file again results in the NULL values error. As well, if we rerun the same file multiple times the incidence of NULL values varies slightly and does not always seem to impact the same rows. I tried outputting data to a log file to see if I can determine what happens and no error messages are returned but it seems to be the case that the NULL values occur after pulling in the data via a Data Reader. Has anyone seen anything like this before or does anyone have a suggestion on how to try and get some additional debugging information around this error?
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Dec 9, 2013
I have SQL Server 2012 SSIS. I have Excel source and OLE DB Destination.I have problem with importing CustomerSales column.CustomerSales values like 1000.00,2000.10,3000.30,NotAvailable.So I have decimal values and nvarchar mixed in on Excel column. This is requirement for solution.However SSIS reads only numeric values correctly and nvarchar values are set as Null. Why?
CREATE TABLE [dbo].[Import_CustomerSales](
[CustomerId] [nvarchar](50) NULL,
[CustomeName] [nvarchar](50) NULL,
[CustomerSales] [nvarchar](50) NULL
) ON [PRIMARY]
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Mar 29, 2006
Hi
can somebody explain me how I can assign a NULL value to a datetime type field in the script transformation editor in a data flow task.
In the script hereunder, Row.Datum1_IsNull is true, but still Row.OutputDatum1 will be assigned a value '0001-01-01' which generates an error (not a valid datetime). All alternatives known to me (CDate("") or Convert.ToDateTime("") or Convert.ToDateTime(System.DBNull.Value)) were not successful.
Leaving out the ELSE clause generates following error: Error: Year, Month, and Day parameters describe an un-representable DateTime.
If Not Row.Datum1_IsNull Then
Row.OutputDatum1 = Row.Datum1
Else
Row.OutputDatum1 = CDate(System.Convert.DBNull)
End If
Any help welcome.
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Apr 17, 2008
Hi
I have two tables. one MasterDetail and second is countrydetail
In master detail i have MasterDetailId (Primary) and countryId.
In CountryDetail table I have Countrid (Primary),CountryName.
I don't want to give relationship because i can insert null value in countryid in MasterDetail table.
So i have wriiten query like this
-> select c.CountryName,m.MasterDetailId from MasterDetail m,CountryDetail c where c.CountryId=m.CountryId and m.MasterDetailId= '2'
If In MasterDetail table if CountryId is null then it will not show me any record. So I want that record and its value with this query and checking null values. Help me about solving this query.
Thank You
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Mar 11, 2008
I am trying to create a stored proc.
I have to check a parameter for null value and if null then set it to zero
Here is the stored proc
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[UPDATENOA]
(
@Accepted char(10),
@NOAId bigint,
@Court char(30),
@RetainerType char(30),
@PendingInTaxCourt char(1)
)
AS
begin
UPDATE NOA set StageCode = Accepted,Court=@Court,RetainerType=@RetainerType,PendingInTaxCourt=@PendingInTaxCourt where NOAId = @NOAId;
Declare @Sequence int
Select @Sequence = MAX(Sequence) From [dbo].[NOAStages] where NOAId=@NOAId;
if @Sequence IS NULL
{
@Sequence=0
}
Insert into [dbo].[NOAStages] (NOAId,StageCode,Sequence)
values (@NOAId,@Accepted,@Sequence+1)
But this is giving me error. What is the correct way to do this.
Thanks
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Nov 9, 2000
Hi,
My query "select blah, blah, rank from tablewithscores" will return results that can legitimately hold nulls in the rank column. I want to order on the rank column, but those nulls should appear at the bottom of the list
e.g.
Rank Blah Blah
1 - -
2 - -
3 - -
NULL - -
NULL - -
At present the NULLs are at the top of the list, but I do not want my ranking in descending order. Any suggestions?
Thanks
Dan
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Jul 28, 2015
I have a string variable
string str1="1,2,3,4,5";
I have to use the above comma separated values into a SQL Search query whose datatype is integer. How would i do this Search query in the IN Operator of SQL Server. My query is :
declare @id varchar(50)
set @id= '3,4,6,7'
set @id=(select replace(@id,'''',''))-- in below select query Id is of Integer datatype
select *from ehsservice where id in(@id)
But this query throws following error message:
Conversion failed when converting the varchar value '3,4,6,7' to data type int.
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May 19, 2006
SELECT whatever_field, CASE LEN(DrAccount) WHEN 12 THEN DrAccount ELSE CASE (Note1) WHEN NULL THEN Location + DrAccount ELSE Note1 + DrAccount END END AS Account FROM Table1 The purpose of the CASE(Note1) is when Note1 column is null, return Location+DrAccount. The actual result is when Note1 column is null, it always returns null, Location+DrAccount is not executed. When Note1 column is not null, it returns correctly Note1+DrAccount. The problem seems to reside in validating the null value in WHEN NULL How to check for null in CASE(fieldname) WHEN ???
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Jun 20, 2007
the SQL string below worked, and then started bringing up every record.
it should only select records with a value in at least one of the columns, but it apears to be suggesting that all records have some data in one of the columns. if I check the database or the output on the web page there apears to be no data. ?? confused.
"SELECT id, make, model FROM vehicles WHERE workToBeDone1 IS NOT NULL OR workToBeDone2 IS NOT NULL OR workToBeDone3 IS NOT NULL OR workToBeDone4 IS NOT NULL OR workToBeDone5 IS NOT NULL"
Any ideas how I could implement this more robustly?
cheers
M
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Apr 14, 2015
Content table
deleteddate revokeddate
1/1/2001 null
null 2/2/2003
4/5/2004 null
I am trying to create a stored procedure where.I need to loop through every row of the table and check if there exists a date in either of the column. If date exists in either of the column for every row, I need to update some other stuff.For the above table, it meets my requirement, so I need to update. However if the table is as below, it doesn't meet the requirement, so I don't need to update
deleteddate revokeddate
1/1/2001 null
null null
4/5/2004 null
I started off as below, But I am getting incorrect values.
Declare @deleterevoke bit
Declare @DelRevId int
Declare @DelRevnumrows int
Declare @tempDeletedDate datetime
Declare @tempRevokedDate datetime
[code]....
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Jul 2, 2007
hi guys, I'm using SQLServer 2005 and I was wondering how I check if some variable is null or not? I tryied to do as the code show but it doesn't work:
declare @number int
set @number = (select number from numbers where number_id = 1)
if (@number = null)
begin
set @number = 12
end
Thank you very much
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Aug 23, 2007
Okay, I have the following statement for my store procedure:
Code Snippet
IF exists (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID))
SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID)
ELSE
SELECT null ID, 'No parent page yet' title FROM Outlook
I wanted to put an ELSE IF statement right before the ELSE statement to check if the value is null. Something like this:
IF exists (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID))
SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID)
ELSE IF (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID) != null
SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID)
ELSE
SELECT null ID, 'No parent page yet' title FROM Outlook
Or if this is possible, it's much better:
IF exists (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID) AND (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID) != null)
SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID)
ELSE
SELECT null ID, 'No parent page yet' title FROM Outlook
I don't quite get how to write the SQL statement that I wanted so any help is much appreciated.
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Aug 26, 2015
I developed the following T-SQL query that runs successfully, but I was looking for a more efficient and concise way to do this. Is there a CTE that can replace all of these case statements? I've updated my query as below. Although this sample query works, it's not working for my real data. Instead, I get an error. At the bottom is the error part of my real query.I copied all of the tables from the first query block below. But when I wrote the bottom query block, it underlined in red the words "answer" and "question." It says "Invalid column name".
if exists (select * from tempdb.dbo.sysobjects o where o.xtype in ('U') and o.id = object_id(N'tempdb..#hard_values')
) DROP TABLE #hard_values;
if exists (select * from tempdb.dbo.sysobjects o where o.xtype in ('U') and o.id = object_id(N'tempdb..#dummy_data')
) DROP TABLE #dummy_data;
if exists (select * from tempdb.dbo.sysobjects o where o.xtype in ('U') and o.id = object_id(N'tempdb..#temp')
[code]...
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Jan 27, 2008
I'm about ready to pull my hair out. I have a repeater control, and a date field. If the field is a valid date, I'll use it to calculate and display the person's age. Otherwise, I want to display "N/A". My problem is trying to determine if the date field is null or not.I'm using SQL Server 2005 which allows Nulls in the date field, and for many records I don't have a birth date. It makes sense for these records to leave the date Null. This is my code:Protected Sub Repeater1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles Repeater1.ItemDataBound If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then Dim LabelIcon As Label = CType(e.Item.FindControl("LabelIcon"), Label) Dim LblAge As Label = CType(e.Item.FindControl("LblAge"), Label) Dim inmate As WAP.prisonmembersRow = CType(CType(e.Item.DataItem, System.Data.DataRowView).Row, WAP.prisonmembersRow) If System.IO.File.Exists(Server.MapPath("~/images/picts/" & inmate.FILE2 & ".jpg")) Then LabelIcon.Visible = True End If If inmate.DATE_OF_BIRTH Is DBNull.Value Then If IsDate(inmate.DATE_OF_BIRTH) Then LblAge.Text = "Age: N/A" Else LblAge.Text = "Age: " & GetBirthdate(inmate.DATE_OF_BIRTH) End If End If End IfEnd Sub How can I resolve this?Diane
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Sep 9, 2014
declare @user varchar(30) = ''
if(@user is not null or @user <> '')
BEGIN
print 'I am not empty'
END
ELSE
BEGIN
print 'I am empty'
ENd
The output should be 'i am empty' but when i execute this i am getting ' i am not empty'. even i did browse through but i don't find the difference in my logic.
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Mar 20, 2006
Hi!I have a table with a check constraint. But unfortunately it does notwork like I wanted.CREATE TABLE MAP([R_ID] [T_D_ID] NOT NULL,[R_ID1] [T_D_ID] NULL,CONSTRAINT CHECK_ID1 CHECK (R_ID1 = R_ID OR R_ID1 = NULL),CONSTRAINT [PK_MAP] PRIMARY KEY ([R_ID]))R_ID1 should always have the value of R_ID or NullThe following statements should cause errors:insert into map (R_ID, R_ID1)values(1,2);update map set R_ID1=3 where R_ID=1;But there occur no errors. Does anyone have an idea? It is an SQL Server2000.TIASusanne
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Jul 20, 2005
Hi, I have a record set that is bound to a table in MS SQL Server. Onefiled in the table is bound to a "long" type member variable in theRecordSet. What will happen to the "long" variable when the field isNULL in the table?Thanks!-Yi
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Feb 4, 2008
A report I maintain has an extensive footer that appears on each page, populated with information I've stashed into invisible cells in the table's header. This works great, except in rare circumstances where the report includes a page that doesn't display the table at all--in which case the report errors when it attempts to print ("Object reference not set to an instance of an object").
Due to the requirements of the report, I cannot guarantee that the table will appear on every page, every time. Is there a way I can safely refer to the reportItems collection, in case of Nulls? I'll be okay with blank values in the footer in the cases where the page has no reportItems to work with, but I can't have the report blow up when printing.
Thanks in advance,
Jeff Lautenschlager
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Aug 16, 2006
I have a column say 'ActivationDate' which is a (database timestamp [DT_DBTIMESTAMP]) which I want to replace with an expression in derived columns
The condition is if 'ActivationDate' field is null or '' then 'Null' else 'ActivationDate'
I am struggling to write this condition. Without condition i.e. at present it saves the value in this database '1753-01-01 00:00:00.000'.
In the preview the 'ActivationDate'field does not show any thing so I recon it is either null or ''
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