Within A SELECT, How Do I Replace An Empty Or Null Value With A Value From Another Table?

Apr 20, 2008

Hello,
I'm a beginner in SQL and I have been searching through the SQL Cookbook and Google but I can't seem to find an example of what I want to do. 
I want to create a report that will return names and emails using two of my tables. I want to use the email in my primary table in the select but if it is null or empty I want to replace it with an email from my secondary table.
Below is what I would like to do but I got a syntax error with it in SQL Server 2000.
SELECT MemberID As ID,
MemberFirstName As FirstName,
MemberLastName As LastName,
(IF MemberEmail = '' THEN SELECT TOP 1 OtherEmail FROM OtherTable WHERE OtherID = MemberID) As Email
FROM PrimaryTableThanks for your time.
Jason 
 

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Derived Column Logic To Replace Empty String With Null?

Nov 7, 2006

Ok.. so I have a fixed position data feed. I read the file in as just whole rows initially, process a specific position and evaluate a conditional split to determine direction of the file for proper processing (file contains multiple recors with different layouts). This all works fine. I then use the derived column feature to process all the columns.

Most of the columns are as simple as SUBSTRING(RecordData,1,10) for example to get the first column. This all works for string data. I then have a column that is a date field. The problem occurs that the code SUBSTRING(RecordData,20,10) returns either a date or empty set of data if no date was in the original file. When this gets sent to the OLEDB connection (SQL Server 2005) into the date field it fails. If the record has a date it works, but if it is empty it fails the insert.

I tried to replace empty strings with NULLs with this code. REPLACE(TRIM(SUBSTRING(RecordData,20,10)),"",NULL(DT_WSTR,10)). This does not work. So my question is how do I bring a date field from a fixed flat file into a SQL datetime field using a derived column? More specifically is how do I set it to NULL if its empty data? When I use the above code it inserts all the rows from the file, but it sets all rows to NULL not just the empty ones.

Thanks.

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Hi.

1.
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2. In the same query I have a left join as well.
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Is it possible to force this <NULL> value to be a fixed string value instead in the select statement.

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Aug 3, 2005

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May 29, 2001

I have an automatic data collection system. The large majority of the time, all data is electronically gathered. On occasion, the need arises to substitute a manually entered value into the data when a valuable piece of information cannot be electronically secured. When a piece of data is open to substitution, it arrives with a value of -9999 (a value not naturally occuring) in Table A. I want to be able to use a trigger on table A to get its substitution value from a corresponding column (Same name) in Table B. Tables A & B will have an identical schema. A is raw data, B is the manually updated table. Any value in the raw table with the content of -9999 gets its replacement from Table B.


I'm open to any ideas!!

RC =:((

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Jul 22, 2007

Hello,



I have a query that returns the appropriate values I need, however there is one field I'd like to add and utilize but my problem is I only want to use it if it contains data.



If I filter it with IS NOT NULL it returns all the records, including the empty records. The field is simply empty, and doesn't come back as NULL. If I filter it with =' ' , it shows all the records with the empty records only.



I need to do the opposite, be able to filter it only if it's not empty.



Any help would be appreciated.

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Feb 6, 2008

how can I insert a constant value such as the word "NoPhone" when a field value from a select statement is null?
Here is my code:

select AgencyName
,AgencyLoc,
,ISNULL(AgencyPhone.Agency,) as phone

How can we put in the words "nophone" when phone is null?

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Empty String To Null

Jul 11, 2001

example
create view v_GuestOrder
as
Select T1.id_Guest,T2.OrderName
from Guest T1
left join Order T2 T2.id_order = T1.Id_order


select * from v_GuestOrder
--
Id_Guest OrderName
-------- -----
1 spoon
2 phone
3
4 tv

I need something similar to

Select
id_Guest,
case orderName
when '' then Null -- Sql server gives error in thsi case
end as orderName
from v_GuestOrder

So I need to assign NULL to OrderName is query return empty string,
it will be treated by Crystal reports as Null

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Mar 16, 2008

How can I make empty cells show NULL on my table? Some cells show NULL others won't. Does this mean that they have contents?

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Thanks!

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Mar 25, 2008

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Sep 4, 2003

Hi all smart people,

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I have to have a select statement which will select all the data but the field contain null value it has to replace with spaces. How can I do that ?

Thanks,

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Apr 1, 2013

I need to separate the data from one column in to two columns based on the transaction type TRAN_TYPE (C is credit, D is Debit)

TRAN-TYPE| AMOUNT
C 20.00
D 30.00
C 50.00

To do that I have this code:

select
CASE WHEN TRAN_TYPE = 'D'THEN CAST (ISNULL(amount, 0) as varchar (30)) end as DEBIT,
CASE WHEN TRAN_TYPE = 'c'THEN CAST (ISNULL(amount, 0) as varchar (30)) end as CREDIT
FROM HISTORY

And my output is:

DEBIT | CREDIT
----------------
NULL | 20.00
------|-------
30.00 | NULL
------|-------
NULL | 50.00
------|-------

how to replace the null values with 0

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Dec 18, 2007

Thank u Chirag....

but i should display all the records of that table not only price column.

consider the column price in titles table in pubs database. If the price of any record is not defined it should be retrieved as -9999.

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Mar 4, 2008

select distinct
case when item is null then replace(item,null,'-')
else itemend
end as item
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i want to replace all null values to '-'...but still i m getting null values..

syntax is correct still not getting results..

can anyone help?

thanks.

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I also want to know whether to use a Trigger or a Function/Stored Procedure.

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Mar 9, 2007

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thanks
regards
Mohammad Yaseen

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SQL 2005 Select Into Temp Table Then Insert Causes Null Issue

Jul 20, 2007

Here is the scenario that I cannot resolve



CREATE TABLE [dbo].[tEvents](

[EventID] [int] IDENTITY(1,1) NOT NULL,

[EventName] [varchar](1000) NOT NULL,

CONSTRAINT [PK_tEvent] PRIMARY KEY CLUSTERED

(

[EventID] ASC

)WITH FILLFACTOR = 90 ON [PRIMARY]

) ON [PRIMARY]



CREATE TABLE [dbo].[tEventSelections](

[EventSelectionID] [int] IDENTITY(1,1) NOT NULL,

[EventID] [int] NOT NULL,

[StatusPID] [int] NOT NULL,

CONSTRAINT [PK_tEventSelections] PRIMARY KEY CLUSTERED

(

[EventSelectionID] ASC

)WITH FILLFACTOR = 90 ON [PRIMARY]

) ON [PRIMARY]



then try this



SELECT e.eventName, es.statuspid

INTO #tmpTable

FROM tEventSelections ES

INNER JOIN tEvents E

ON E.EVentID = ES.EventID

INSERT INTO #tmpTable (eventName) values ('Another One')

DROP TABLE #tmpTable



this causes a null insert issue

(0 row(s) affected)

Msg 515, Level 16, State 2, Line 7

Cannot insert the value NULL into column 'statuspid', table 'tempdb.dbo.#tmpTable___________________________________________________________________________________________________________000000000130'; column does not allow nulls. INSERT fails.

The statement has been terminated.



So how do I allow the null, as the not null is coming from the ES table. But I want to allow the insert to happen without having to create the table first, this code works in SQL 2000 but fails in 2005, inserting all fileds into the insert also has it's own issues as some of the fields are delibertly left blank so in some circumstances the data returned to a grid displays correctly.



This method has been used in quite a lot of stored procedures and will be a nightmare to correct if each has to be edited.



One example of the use of is to return a dataset and then add a row at the bottom which is a sum of all the rows.



Regards

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Jan 12, 2008

Hi:
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Thanks a lot.
Jt

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Oct 12, 2004

************* Edited by moderator Adec ***************
Inserted missing < code></ code> tags. Always include such
tags when including code in your postings. Don't force the
moderators to do this for you. Many readers disregard
postings without the code tags.
**************************************************

Well met,

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Example code:

if (tboxNAME.Text == "")
{
sqlCommand1.Parameters["@NAME"].Value = DBNull.Value;
}
else
{
sqlCommand1.Parameters["@NAME"].Value = tboxNAME.Text;
}

Is the above overkill? It seems like it would be a good idea to set fields which the user empties back to Null rather than an empty string.

Thanks,

-Tony

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(
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