>>>>>Hi All,
>>>>>
>>>>>how can i use this line Iif(Empty(thisform.txtID.Value),'.t.','CrsTable.ID=thisform.txtID.value') in T-Sql where clause?
>>>>>
>>>>>Thanks
>>>>
>>>>Solved myself :)
>>>>
>>>>WHERE vw_CrsStokhb.fiskodu = CASE WHEN @fiskodu is not null then @fiskodu ELSE vw_CrsStokhb.fiskodu END
>>>
>>>Please read this blog post http://blogs.lessthandot.com/index.php/datamgmt/datadesign/do-you-use-column-param-or-param-is-null/ and blogs referenced in the comments to it.
>>
>>A quick note: "Column = @Param OR @Param IS NULL" is not the same as "@Param IS NULL OR Column = @Param".
>
>Why? It is exactly the same.

For MSSQL's sake, I hope it isn't!

When the first condition is true, the second is not tested. So, in the second expression, if @Param IS NULL there is no need to check on Column's value.