Null dates and 1900-01-01 and sql server 2008

Hi,

Are you using LINQ?

The corect T-SQL syntax is

if exists(
  select 1
  from <yourtablename>
  where
    <yourcolumn> is null
  )
  <true clause here>

I suspect that the ISNULL($Activity_Date) is responsible for yoru dilema.

Regards
  David

Hi David,

In SQR to check for the presence of a value using an if statement, you can use ISNULL. The syntax explanation is this :

ISNULL
-------
Returns a value of one (1) if source_val is null; otherwise, returns a
value of zero (0).

Syntax:

dst_var = isnull(source_value)
source_value = date or text literal, column, variable, or expression

dst_var = decimal, float, or integer variable

Example:

let #null = isnull($date)

***************************************************************************************************************
What happens next in the program is that we do an insert sql statment:

begin-sql
INSERT INTO PS_NCSF4204
      (OPRID
      ,RUN_CNTL_ID
      ,EMPLID
      ,ACCOUNT_TYPE_SF
      ,TERM_DESCR
      ,ITEM_NBR
      ,DESCR
      ,AMOUNT
      ,ITEM_TYPE_CD
      ,LAST_ACTIVITY_DATE
      ,STRM)
VALUES
      ($_prcs_oprid
      ,$_prcs_run_cntl_id
      ,$Emplid
      ,$Account_Type_SF
      ,$_DescrShort
      ,$Item_Nbr
      ,$Descr
      ,#Total
      ,$Item_Type_CD
      ,  !SNULL ( CONVERT(varchar(10),$Activity_Date, 120), ' ' )
                      ,$Term)
end-sql
 

   ************************************************************************************************************
So, I tried the ,  !SNULL ( CONVERT(varchar(10),$Activity_Date, 120), '  ' )
to get a blank date instead of 1900-01-01  but that does not work. When I query NCSF4204, i still see the 1900-01-01 where the dates were supposedly null.

Thank you,
Lucy

ISNULL ( CONVERT(varchar(10),$Activity_Date, 120), ' ' )

Would definitely produce '1900-01-01' by your own words above as '' or ' ' or 0 will result in default datetime value with is '1900-01-01'.  If the value is NULL at some point in your code, something has to be converting this to an empty string or something.

Otherwise, how are you checking if the data is NULL in the database?  Are you looking in SQL Management Studio at the raw data ? Just make sure the query to get data isn't using coalesce or isnull to convert to to date 0 if the value is NULL.

Is the column set to allow NULL dates, maybe it has a default of 0 specified.

 !SNULL ( CONVERT(varchar(10),$Activity_Date, 120), ' ' )


Hi,

Sorry about that it should be a null.  Regardless, it did not work.  It still gave a null.  

I checked the table design. For that particular column , the allow null column is checked off in Sql Analyzer.

Also, as you have suggested, looked in the original table where the value is picked up and
and there there is no coalesce or null being used.

I also did a query on this original table liike this :
Select * from PS_ITEM_SF table where LAST_ACTIVITY_DATE  IS NULL.

No rows were  returned.

Yet when I feed the value into the statement like this

:Let $Activity_Date       = &B.LAST_ACTIVITY_DATE

and insert into the table I get this 1900-01-01 for values that don't exist.

A collegue suggested that I explicitly declare the  $Activity_Date   as  a date variable but that did not work either.

Right now I just suppress it in the Crystal.

Thank you,
Lucy