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"


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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"


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Default To NULL Instead Of Blank/empty String During Flat File Import

Aug 15, 2006


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:

1- set the DEFAULT(NULL) for EVERY column that needs this behaviour

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.



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Dec 30, 2003

I need to pass in null/blank value in the date field or declare the field as string and convert date back to string.

I tried the 2nd option but I am having trouble converting the two digits of the recordset (rs_get_msp_info(2), 1, 2))) into a four digit yr. But it will only the yr in two digits.
The mfg_start_date is delcared as a string variable

mfg_start_date = CStr(CDate(Mid(rs_get_msp_info(2), 3, 2) & "/" & Mid(rs_get_msp_info(2), 5, 2) & "/" & Mid(rs_get_msp_info(2), 1, 2)))

option 1
I will have to declare the mfg_start_date as date but I need to send in a blank value for this variable in the stored procedure. It won't accept a null or blank value.

With refresh_shipping_sched
.ActiveConnection = CurrentProject.Connection
.CommandText = "spRefresh_shipping_sched"
.CommandType = adCmdStoredProc
.Parameters.Append .CreateParameter("ret_val", adInteger, adParamReturnValue)
.Parameters.Append .CreateParameter("@option", adInteger, adParamInput, 4, update_option)
.Parameters.Append .CreateParameter("@mfg_ord_num", adChar, adParamInput, mfg_ord_num_length, "")
.Parameters.Append .CreateParameter("@mfg_start_date", adChar, adParamInput, 10, "")
Set rs_refresh_shipping_sched = .Execute

Please help

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Aug 29, 2007

What is the difference updating a null value to char/varchar type column

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Could anyone explain about this?


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,''
tCountryDetails.State = '' or tCountryDetails.State = null?

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Feb 11, 2008

This seems to be a rather old problem ( but I couldn't find an answer yet.

The problem is: I have two tables t1 and t2 where t1 is a staging area of t2.
t1: (id int not null, phone varchar(30))
t2: (id int not null, phone varchar(30))

Data in t1: (1, '') <- empty string
Data in t2: (1, ' ') <- a blank

Comparing with results in equality which in my opinion isn't correct.

The question ist: How can I change the behaviour of SQL-Server to result in inequality so that the change in my staging table is detected correctly?

Thanks in advance

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Sep 9, 2014

declare @user varchar(30) = ''
if(@user is not null or @user <> '')
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print 'I am empty'

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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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),
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from Finance
GROUP BY [Original], [FinanceYear]

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Oct 28, 2015

I am using SSDT to deploy my database project. This project has a post deployment script and i am creating a new user in this post deployment script. I have used sqlcmd variable to capture the username. I am doing a null/empty check for this variable and my code looks like below.

IF (([$(UserName)] IS NOT NULL) OR ([$(UserName)] <> ''))

When i execute this, I am getting below error.

Could not deploy package.

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Error SQL72045: Script execution error. The executed script:

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Jul 11, 2001

create view v_GuestOrder
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
4 tv

I need something similar to

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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Would want:


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Nov 9, 2007

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Jan 12, 2008

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.

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Hi all,   I have some columns in my database which allows null.  I want to know if leaving the field to be NULL or storing an empty string into the field, which will take up more space?? if the field type is varchar(100)

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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.


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Aug 13, 2015

I added a new field to an existing ETL process which uses SSIS to ingest a CSV file. The new field in the file, Call_Transaction_ID, will not always be populated for every record and so can be NULL or empty for certain records.

Here's the problem:After the file is extracted into a staging table, the Call_Transaction_ID field is showing blank or empty when it has no ID for that particular record. The problem is when I try to then ETL this data into a fact table - I'm trying to set the Call_Transaction_ID field to -1 if it is NULL or empty, however SQL Server doesn't see the field as empty even though there is no value in the field so -1 will NEVER return.

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

What do I do now to get around this? How do I fix it?

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Oct 25, 2006

How do I define a field to have the default value = ''. Not NULL but not a space either in SQL Server 2005?

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Apr 2, 2008

Originally, I hit this problem with PHP. But then I was able to reproduce using VBScript.

I have a table with a couple of text fields, and one Real field in a table. One row of data in the table. Both text fields set, but the real field doesn't even need to have a value set.

Connecting to SQL 2005 using a DSN - ODBC.

I'm using a stored procedure I named ExecIt that runs a SQL statement that is sent in and returns records.

If I use cursor location adUseClient, it returns values for the text fields.

If I use asUseServer, it returns blank values.

If I use a SQL statement directly, it works. Only fails when using SQL statement by way of ExecIt.

In each case, cursor type is adOpenStatic or adOpenDynamic.

Using this combination fo cursor type and cursor location, it mimics what I see in SQL profiler when PHP is using ODBC.

Anyone have a solution?


CREATE TABLE [dbo].[test3](

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

[text1] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,

[text2] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,

[real1] [real] NULL,






Stored Procedure - ExecIt:

create PROCEDURE [dbo].[ExecIt]

-- Add the parameters for the stored procedure here

@Statement nvarchar(max)



exec (@Statement)


DSN has been set up through ODBC manager. Can be using 2005 native driver, or older sql server driver.


dim txtOut

set conn1=CreateObject("ADODB.Connection")
conn1.Open "my-DSN","my-userid","my-password"
sql="exec execit 'select * from test3 where ID=1'"
set rs = CreateObject("ADODB.recordset")
rs.CursorLocation = 2 'adUseServer - 2, adUseClient - 3
rs.CursorType = 3 'adOpenStatic
rs.Open sql,conn1
if not rs.EOF then
txtOut = "Results" & vbcrlf
txtOut = txtOut &"text1:" & rs("text1") & vbcrlf
txtOut = txtOut &"text2:" & rs("text2") & vbcrlf
txtOut = txtOut & vbcrlf
end if
msgbox txtOut

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Jul 20, 2005

Hi,I run a stored procedure with a parameter given from a text box in an accessadp. If the text box is empty then what is passed to the parameter? I can'tseem to get it to flag up as either null, or 0 length.Any tips?Cheers,Chris

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



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May 31, 2004

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CmdUpdate.Parameters.Add("@User_fax", SqlDbType.char, 9)
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USE market1
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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

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Nov 7, 2006

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