How To Cast Empty String

Mar 22, 2006

I want to replace a column value with a null if the string is empty. I would have thought this simple expression would do it:

RTRIM([FromContractSymbol]) == "" ? NULL(DT_STR, 0, 1252) : (DT_STR, 6, 1252)FromContractSymbol

Yet, I get the following error:

For operands of the conditional operator, the data type DT_STR is supported only for input columns and cast operators. The expression "...see above..." has a DT_STR operand that is not an input column or the result of a cast, and cannot be used with the conditional operation.

The expression works if I replace the NULL(DT_STR, 0, 1252) with say "A" and the expression works on other non-string columns. (As in "NULL(DT_I1) : (DT_I1)100")

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Cast String To Int

Apr 27, 2008

Hi ,

I have a problem with casting a string number to int.
for exmaple i have the number '0110' (string) and i would like it to be 110. or '0001' to be 1.
i tried to do:
cast(MyNUM as int) .
but i get "Syntax error converting the nvarchar value 'O322' to a column of data type int."

is anyone have any idea how to solve it ?


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Sep 21, 2006

I created an SSIS package that pulls in legacy data from a DB2 AS400. There is an In Date field that is stored on the AS400 as OdbcType.Date or DATE. However, when I use SSIS to pull in the data, SQL wants it to be a string so I gave up and let SQL have it's way.

Now in my SELECT statement, I have this:

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Should I go back and re-do the SSIS or is there a way to pull the records for this? Thanks for the information

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Feb 5, 2007

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Aug 12, 2007

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Oct 30, 2007

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Aug 1, 2007

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If Not IsPostBack Thenfp = CType(Context.Handler, Member)
'lblEmail.Text = fp.EMM.ToString
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Apr 16, 2014

i am trying to take a field that has part of a date in it, so I have to parse it out as follows:

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This is because a date of 04/16/2014 will show as 160416 in the first part of the field I need to parse it out of, thus becoming 04162014.

From there I then need to convert this "date" into a legitimate SQL datetime type, so that I can then run a DATEDIFF to compare it to when the record was actually entered, which is a separate field in the table, and already in datetime format.

When I use the below statement, I am getting the message that, "Conversion failed when converting date and/or time from character string."

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how I can parse that field, then convert it to a datetime format for running a DATEDIFF statement?

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Jul 11, 2001

create view v_GuestOrder
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select * from v_GuestOrder
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-------- -----
1 spoon
2 phone
4 tv

I need something similar to

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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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Nov 9, 2007

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Jan 12, 2008

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Aug 9, 2005

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,

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Dec 6, 2007

In the Column Properties window's 'Default Value or Binding' property, how do you specify an empty string?


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Jul 7, 2007

How could I define referential integrity using FK constraint which allow me to have empty string/ZERO number instead of NULL value ?

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May 19, 2008


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Oct 25, 2006

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Jun 4, 2008

Hi guys,
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Apr 29, 2014

Can we have blank value in Primary key field? Two fields are chosen as Primary Key for this table but the issue is at any given time one value will be blank when other is populated. Does sql server still order the records based on these keys? (Clustered index). Or should I just go about adding ID (identity)?

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Jul 23, 2005

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Jan 15, 2007

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Is there a way to use configuration files for the assemblies used by CLR SPs? (I don't want to use a static string to point to a file on the disk)

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Feb 13, 2008

I have a problem where I need to include data from a table where one of the joined columns can contain empty strings. The emptry string column and its related columns need to be included in the results of the query.

The Join looks like this:

SalesData.dbo.tbl_CYProcessedSales ps
INNER JOIN SalesData.dbo.vw_Product_CYProcessedSalesXref xr
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AND xr.ProdGroup = nn.Product
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The problem occurs on the xr.BillingType = nn.BillingType portion of the join. the nn.BillingType can contain empty strings. I've tried a LEFT join to vw_NetNewRevenueUnion, but this has not worked.

In vw_NetNewRevenueUnion, BillingType becomes an empty string within a CASE statement if BillingType is NULL. I've thought about using something like 'All' in the ELSE condition, and doing the same in the vw_Product_CYProcessedSales view just so I don't have to deal with an empty string.

If I were not to do that, is there some way I can handle the empty string issue within the join so that empty string records will be included in the query results?

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May 15, 2008

I am using a SQLDataSource with the following Select query. If the "spouse" values are not in the database, I get the HTML non-breaking-space character back, rather than an empty string.

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Here is the relevant code-behind:

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dp.txtDate.Text = "";



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Sep 10, 2015

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Jun 9, 2007

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Mar 10, 2006

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Feb 15, 2007

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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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Nov 24, 2007

Has anyone find solution for this problem.
i also checked and

Suppose have a Dimension table

ColorKeyPK(smallint) ColorAlternateKey(nvarchar(30))
-1 UnknownMember
2 Blue
3 Red
4 Black

Color with the ID 1 is empty string

OrderID Date Color Quantity

OrderID = 1 Color = 'Black' Quantity = 10
OrderID = 2 Color = 'Red' Quantity = 20
OrderID = 3 Color = '' Quantity = 10
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OrderID = 5 Color = Black Quantity = 10

When i use the Lookup transform it cannot find the ColorKeyPK

The result of the Lookup transform is.
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OrderID = 2 Color='Black' ColorKey=3
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OrderID = 5 Color='Black' ColorKey=4

Thanks from now.

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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
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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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