HELP : Empty String To Null Conversion By SQL

Nov 10, 2005

Hi folks,

I've have about 100 tables, for some reasons, column values that are originally NULL was inserted as emtpy string. So, I am wondering if I can write JUST ONE SQL (hopefully don't have to specify the field names in the SQL as well) for each table so that all the empty strings will be converted back to NULL.

THANKS JOHN

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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

Please help , thanks

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Hi:
Trying to insert null value into sql table, but not working, if I use:
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When I go back to table, I see the value is: 'NULL', has single quotation mark, suppose to be: NULL
Where is the problem?
Thanks a lot.
Jt

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I'd like to have Oracle's empty string behavior in SQLServer 2k5. Oracle treats an empty string as NULL's.

In PL/SQL can do:
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Can this be done? I couldn't find a setting for it.

Thanx

Peter

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i have a trigger on a table right now... when fields are inserted, theres a text field inserted and i want to check if that text field = '' (the empty string, not NULL) and if it doesn't equal that, then perform some row updates on other tables, but if it is empty, to not do anything else in the trigger... right now i have this:


Code:


IF ((SELECT Note FROM XATPoDetail WHERE ReqNbr = (SELECT ReqNbr FROM Inserted)) LIKE(''))



Note is the text field, XATPoDetail is the table where its being inserted into. I had to do the select FROM the table because it wouldn't let me select a text data type from the "Inserted" virtual table

but it tells me me "Error 279: The text, ntext, and image data types are invalid in this subquery or aggregate expression"

thanks

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Anyway To Check If A Text Field Is Blank (not Null But Just A Empty String '') ?

Oct 27, 2004

i have a trigger on a table right now... when fields are inserted, theres a text field inserted and i want to check if that text field = '' (the empty string, not NULL) and if it doesn't equal that, then perform some row updates on other tables, but if it is empty, to not do anything else in the trigger... right now i have this:


IF ((SELECT Note FROM XATPoDetail WHERE ReqNbr = (SELECT ReqNbr FROM Inserted)) LIKE(''))


Note is the text field, XATPoDetail is the table where its being inserted into. I had to do the select FROM the table because it wouldn't let me select a text data type from the "Inserted" virtual table

but it tells me me "Error 279: The text, ntext, and image data types are invalid in this subquery or aggregate expression"

thanks

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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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My question is, why my source table column FirstName is showing a NULL value when the derived column datatype is string and the source is string? It should just be showing an empty string right?

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Hi,

In SSIS flat file import using fastload, I'm trying to import data into SQL 2005 previously created tables.

The table may contain column that are NULLable BUT there is NO DEFAULT for them.

If the incoming data from flat files contains nothing either between the delimeters, how can I have a NULL value inserted in the column instead of blank/empty string?

I didn't find an easy flag unless I'm doing something wrong. I know of at least two ways to do it the hard way:

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2-set up some Derived Column option in the package to return NULL if the value is missing.

Both of the above are time consuming since I'm dealing with many tables. Is there a quick option to default the value to NULL WHEN there is NO data ELSE insert the data itself? So the same behavior that I have right now except that I want NULL in place of empty string/blank in the varchar(x) columns.



Thanks

Anatole

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Hi,
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Could anyone explain about this?

Example:

Table 1 : tCountry - Name varchar(80) nullable
Table 2 :tState - Name char(2) nullable
Table 3 :tCountryDetails - countryid,state (char(2) nullable) - May the country contain state or no state
So,when the state is not present for the country ,i have two options may be - null,''
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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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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,

Let's say I have a web form that allows users to insert and update records in a SQL database. Is it better to set empty web controls (textbox, etc.) to DBNull or let it go as an empty string into the database?

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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Using a WHERE DATALENGTH(Call_Transaction_ID) = 0 returns 0 records, again because SQL Server doesn't see the field as empty or NULL.

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BEGIN
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END
ELSE
BEGIN
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ENd

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I have always (or at least intended to) treat NULL and empty strings separately in my SQL querying history. Now I have run across something that mystifies me (but probably shouldn't) that I would like an explanation for.

Consider this bit o' code:

DECLARE @ORDER CHAR(10)
SET @ORDER=
(
SELECT NULL
)
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Run this and you will get:

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I was expecting:

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Sample query I use

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I am using Reporting services 2005.

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...

strConnection.open()
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GO
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Thank you,
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Name Joe Slick

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