Returning CASE As Null Problem

May 6, 2008

Hello again! I'm having yet another problem with my code.


CASE Kit WHEN 'Y' THEN '(Kit)' WHEN 'N' THEN '' END + ' ' +
CASE cream WHEN 'Y' THEN '(cream)' WHEN ' N' THEN '' END + ' ' +
CASE Phone WHEN 'Y' THEN '(Phone)' WHEN 'N' THEN '' END

The problem that I am running into is that if one of the values comes up as NULL the whole field is NULL. am i doing something wrong?

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Transact SQL :: CASE With Subselect And DATEADD Function Returning NULL Values

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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Aug 8, 2006

Hi all,

I am passing in a variable into a CASE statement. Based on the value, I want to return a set of values in an IN clause. Here is an example:

(The where clause will use a field called 'Location')


DECLARE @strTest as Varchar(50)
SET @strTest = 'HI'

SELECT * FROM [SomeTable]
WHERE
CASE @strTest
WHEN 'HI' THEN Location IN('1', '2', '3')
END
ORDER BY Location


Is this possible to do?

Sanctos

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Sep 19, 2014

I have a query that pulls a list of organizations. I'm trying to use a CASE statement to add a column of names based on the relationship of the individual to that organization. It is possible for two people at the organization to both have that relationship to the organization. Currently, when I pull my results, I get all the individual's names for all the organizations, but I'm also getting a row where there is no name, something like:

Company1 ''
Company1 'Individual1'
Company1 'Individual2'

Some of the organizations, they have no one with the relationship, but for all the organizations that do have someone in the position I want to not see the blank row. My case statement is:

CASE WHEN EXISTS
(Select ind_customer.cst_key WHERE ixo_rlt_code = 'Relationship' )
THEN ind_customer.cst_ind_full_name_dn
ELSE ''
END
AS 'FULL NAME'

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May 1, 2005

I have null fields in one of the column and want to return "N/A" when the column is null. How can I do that ?

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Feb 13, 2007

Thanks to everyone in advance

The code below returns the members who have accounts that are inactive, and works correctly.
It returns the memberid, but returns null values for the barcode values.
I am explicitly looking for unmatched rows, i.e. the LEFT OUTER JOIN will return joined member-address
rows which do not have a matching account, according to the ON conditions, and these are the ones I want
because of that WHERE condition.
Therefore account.barcode will always be NULL too.

Is there to perform the same query and return account details?
I have tried running a query to return just the memberid values and then perform a second query to match the account
details, but this is very ineffecient and slow.


select member.memberid, account.barcode
FROM member
INNER
JOIN address
ON address.MemberID = member.Memberid
LEFT OUTER
JOIN account
ON account.Memberid = member.MemberID
AND account.enddate >= current_date
AND account.closed = 0
WHERE account.Memberid is null AND member.isDeleted = 0

Special thanks to r937 for help.
James

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Jul 23, 2005

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Apr 4, 2007

i have 2 stored procedures: a delete and a select.  the delete sp returns the rowcount properly.  the select returns null.  the code for both sp's is extremely simple and extremely similar.  when i execute the select sp in server management studio the rowcount shows a 1 as expected.  but the calling method gets null.
SP Code 
ALTER PROCEDURE [dbo].[RetrieveEmployeeKeyFromAssignmentTable]
@assignmentPrimaryKey int,
@rowCount int OUTPUT
AS
BEGIN
SET NOCOUNT ON;
SELECT employeePrimaryKey FROM assignmentTable WHERE primaryKey = @assignmentPrimaryKey;
SET @rowCount = @@RowCount;
END
c# code
SqlConnection conn = GetOpenSqlConnection();
if (conn == null)  return true;
SqlDataReader reader = null;
SqlParameter p1 = new SqlParameter();  SqlParameter p2 = new SqlParameter();
try {
SqlCommand command = new SqlCommand();
command.CommandText = "RetrieveEmployeeKeyFromAssignmentTable";
command.CommandType = CommandType.StoredProcedure;
command.Connection = conn;
p1.ParameterName = "@assignmentPrimaryKey";
p1.Value = assignmentPrimaryKey;
p2.ParameterName = "@rowCount";
p2.Direction = ParameterDirection.Output;
p2.Value = 0;
command.Parameters.Add(p1); command.Parameters.Add(p2);
reader = command.ExecuteReader();
if (p2.Value == null) //always true
any suggestions would be appreciated.
thanks.  matt

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Jun 4, 2007

I have a simple table on my webpage which shows data from my database.
It all worked fine apart from one part. I wanted the select statement to select only NULL values from a column, as these are classed as open queries. Once I have closed the query a 0 or 1 will automatically be posted and will no longer have a NULL value.
I have a simple select statement (which I will post on here when I log in with my work computer) and at the end I have a WHERE Column = NULL. I have also tried WHERE column <> 0.0 AND column <>1.0 and that did not work.
If I only did WHERE column <> 1.0, i only get the 0.0 results and none of the NULL results, but if I have no WHERE statement I get all the results including the NULL values.
 
Oliver

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Feb 22, 1999

Hi,

I have upgraded database from sql6.5 to sql 7.o

I have a table tblnetwork on which identity property
is defined on column networkid.

When I issue the following command new record is getting inserted into
tblnetwork and identity column is getting incremented properly.
But, I am not able to get the @@identity value
It is returned as NULL.

insert tblnetwork(formalname,networktype)
values ("name2",11897)
select @@identity

I need this value to insert into some other table.
Pls suggest me why @@identity is returning NULL
thanks,
MMS

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Jul 20, 2005

Using SQL2000. I want to return the # of columns with non-nullvalues. Here's my query so far:selectcase when Dx1 is not null then 0 else 1 end +case when Dx2 is not null then 0 else 1 end +case when Dx3 is not null then 0 else 1 end +case when Dx4 is not null then 0 else 1 end as DxCountfrom tblClerkshipDataCleanwhere PalmName = @PalmNameThere are 7 rows for the particular PalmName I'm using. The queryreturns a result of 7. However, there are 25 values in Dx1 thru Dx4so the query should be returning 25.What am I doing wrong here? Thanks in advance.

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Mar 9, 2006

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Any advice is appreciated.



thanks

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Jun 5, 2006

I am trying to insert a record to based on the source below, however the GUID of GiftOcc_ID is being returned as zero's so the first record can be added but as it is defined as the primary Key and uniqueidentifier the next record fails with a duplicate entry. Basically how do I ensure that the GUID is created and not nulls. As you can see I am trying to use Newid() which I have inserted as a default value but that does not work. Also as it is a unique identifier the "is identity" is not available
 
Protected Sub CreateGiftOccasion(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
Try
Dim null As New Nullable(Of Integer)
Dim da As New DataSet2TableAdapters.Gift_OccasionTableAdapter
Dim GiftOcc_ID As Guid
da.Insert(newid(), Occ_Type_Text.Text, Occ_Desc_Text.Text, Calendar1.SelectedDate, Calendar2.SelectedDate, 1)
Catch ex As Exception

Response.Write("Ooops")
End Try
End Sub
 
The code from the table adapter regarding inserts is:
<InsertCommand>
<DbCommand CommandType="Text" ModifiedByUser="False">
<CommandText>INSERT INTO [dbo].[Gift_Occasion] ([GO_ID], [Go_Type], [GO_Description], [GO_DateOn], [GO_DateOff], [GO_Active]) VALUES (@GO_ID, @Go_Type, @GO_Description, @GO_DateOn, @GO_DateOff, @GO_Active);
SELECT GO_ID, Go_Type, GO_Description, GO_DateOn, GO_DateOff, GO_Active FROM Gift_Occasion WHERE (GO_ID = @GO_ID)</CommandText>
<Parameters>
<Parameter AllowDbNull="False" AutogeneratedName="" DataSourceName="" DbType="Guid" Direction="Input" ParameterName="@GO_ID" Precision="0" ProviderType="UniqueIdentifier" Scale="0" Size="0" SourceColumn="GO_ID" SourceColumnNullMapping="False" SourceVersion="Current">
</Parameter>
<Parameter AllowDbNull="True" AutogeneratedName="" DataSourceName="" DbType="AnsiString" Direction="Input" ParameterName="@Go_Type" Precision="0" ProviderType="Text" Scale="0" Size="0" SourceColumn="Go_Type" SourceColumnNullMapping="False" SourceVersion="Current">
</Parameter>
<Parameter AllowDbNull="True" AutogeneratedName="" DataSourceName="" DbType="AnsiString" Direction="Input" ParameterName="@GO_Description" Precision="0" ProviderType="Text" Scale="0" Size="0" SourceColumn="GO_Description" SourceColumnNullMapping="False" SourceVersion="Current">
</Parameter>
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</Parameter>
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</Parameter>
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</Parameter>
</Parameters>
</DbCommand>
</InsertCommand>
 
Many thanks in advance for any assistance
 
 
 

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Nov 28, 2006

I'm still having issues with this despite my attempts to resolve. I even
have "with exec as dbo" in my sproc, and and "exec as dbo" in my execution,
but still the encrypted data returns nulls when I exec as a user other than
DBO. Below is precisely what I have done. All ideas are welcomed.

TIA, ChrisR


--If there is no master key, create one now

IF NOT EXISTS
(SELECT * FROM sys.symmetric_keys WHERE symmetric_key_id = 101)
CREATE MASTER KEY ENCRYPTION BY
PASSWORD =
'23987hxJKL95QYV4369#ghf0%94467GRdkjuw54ie5y01478d Dkjdahflkujaslekjg5k3fd117
r$$#1946kcj$n44ncjhdlj'
GO

CREATE CERTIFICATE HumanResources037
WITH SUBJECT = 'Employee Social Security Numbers';
GO

CREATE SYMMETRIC KEY SSN_Key_01
WITH ALGORITHM = DES
ENCRYPTION BY CERTIFICATE HumanResources037;
GO

USE [AdventureWorks];
GO

-- Create a column in which to store the encrypted data
ALTER TABLE HumanResources.Employee
ADD EncryptedNationalIDNumber varbinary(128);
GO

-- Open the symmetric key with which to encrypt the data
OPEN SYMMETRIC KEY SSN_Key_01
DECRYPTION BY CERTIFICATE HumanResources037;

-- Encrypt the value in column NationalIDNumber with symmetric
-- key SSN_Key_01. Save the result in column EncryptedNationalIDNumber.
UPDATE HumanResources.Employee
SET EncryptedNationalIDNumber = EncryptByKey(Key_GUID('SSN_Key_01'),
NationalIDNumber);
GO

-- Verify the encryption.
-- First, open the symmetric key with which to decrypt the data
OPEN SYMMETRIC KEY SSN_Key_01
DECRYPTION BY CERTIFICATE HumanResources037;
GO

-- Now list the original ID, the encrypted ID, and the
-- decrypted ciphertext. If the decryption worked, the original
-- and the decrypted ID will match.

alter procedure getDecryptedIDNumber
with exec as owner
as
SELECT NationalIDNumber, EncryptedNationalIDNumber
AS "Encrypted ID Number",
CONVERT(nvarchar, DecryptByKey(EncryptedNationalIDNumber))
AS "Decrypted ID Number"
FROM HumanResources.Employee;
GO

/*works for me, shows the decrypted data*/

exec getDecryptedIDNumber

USE [master]
GO

CREATE LOGIN [test] WITH PASSWORD=N'test',
DEFAULT_DATABASE=[AdventureWorks], CHECK_EXPIRATION=OFF, CHECK_POLICY=OFF
GO

USE [AdventureWorks]
GO

CREATE USER [test] FOR LOGIN [test]
GO

use [AdventureWorks]
GO

GRANT EXECUTE ON [dbo].[getDecryptedIDNumber] TO [test]
GO

GRANT IMPERSONATE ON USER:: dbo TO test;
GO

/*Now, open up a "file/new/DB Engine Query" and login with the test login*/
exec as user = 'dbo'
exec getDecryptedIDNumber

/*This returns NULL values where it should show the decrypted data*/

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AS
BEGIN

OPEN SYMMETRIC KEY MyKey DECRYPTION BY PASSWORD= 'MY_Password_128';

Declare @Temp varbinary(8000);

Set @Temp =EncryptByKey(Key_GUID('MyKey'),@ClearText);

close symmetric key MyKey;

select @Temp as temp;
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Hi there ;
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Code:


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System.out.println("b = " + b);
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This code is returning null resultset.

But when I fire the same query directly into MS SQL, it is returning the corresponding rows.

I dont know where i'm going wrong. But just to make things more clearer, here's my connectivity code :

Code:


Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
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Table 1 - Modules:
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2 | B
3 | C

Table 2 - CompanyModules
ModuleID | CompanyID
1 | 1
2 | 1
3 | 1
1 | 2


I'd like to return the following result set:
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1 | A | True
1 | B | True
1 | C | True
2 | A | True
2 | B | False
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Edit: This is the query I have tried:


select CompanyModules.CompanyID, Modules.Name, count(Modules.ID) as Present from

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group By CompanyModules.CompanyID, Modules.Name

Order by CompanyID


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1 | A | 1
1 | B | 1
1 | C | 1
2 | A | 1

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Case, Joins And NULL Trouble

Jul 23, 2005

HiConsider two tablesid1 code1----------- -----1 a2 b3 cid2 code2 value----------- ----- -----------1 a 02 a 13 b 1They are joined on the code field.For each code, I want the maximum corresponding value. If the valuedoesn't exist (corresponding code in second table doesn't exist), I wanta NULL field returned.The result should look like this:code2 value----- -----------a 1b 1c NULLI can't get it to include the NULL row.While there are uniqe ID's in this example, the real life example uses ahorrible four field compound key.Any help would be appreciated.Ger.The above example can be recreated by the following script.DROP table #temp1DROP table #temp2SELECT 1 AS 'id1', 'a' AS 'code1'INTO #temp1UNIONSELECT 2, 'b'UNIONSELECT 3, 'c'SELECT 1 AS 'id2', 'a' AS 'code2', 0 AS valueINTO #temp2UNIONSELECT 2, 'a', 1UNIONSELECT 3, 'b', 1SELECT code2, valueFROM #temp1 t1LEFT JOIN #temp2 t2 ON t1.code1 = t2.code2WHERE CASEWHEN t2.value IS NULL THEN 1WHEN t2.value = 0 THEN 2WHEN t2.value = 1 THEN 3END = (SELECTMAX( CASEWHEN value IS NULL THEN 1WHEN value = 0 THEN 2WHEN value = 1 THEN 3END )FROM#temp2WHEREcode2 = t2.code2)

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Why Is My Select...Case Generate Only NULL Value?

Nov 9, 2007



Here's what I have and it's not working.



Code Block
SELECT [userID],
CASE
WHEN [mdlName] = NULL AND [mdnName] = NULL THEN [lstName] + ', ' + [fstName]
WHEN [mdlName] <> NULL AND [mdnName] <> NULL THEN [lstName] + ', ' + [fstName] + ' ' + [mdlName] + ' ' + [mdnName]
WHEN [mdlName] <> NULL AND [mdnName] = NULL THEN [lstName] + ', ' + [fstName] + ' ' + [mdlName]
WHEN [mdnName] <> NULL AND [mdlName] = NULL THEN [lstName] + ', ' + [fstName] + ' ' + [mdnName]
END AS [Full Name]
FROM [grUser]
ORDER BY [Full Name] ASC





The [Full Name] is always null. Any idea why? What I'm trying to do is if mdlName (middle name) and mdnName (maiden name) is null then display the lstName (last name) and fstName (first name) only and so on.

Any help is much appreciated.

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