Question

Facing problem for generating SQL Server Query
In the Following query dynamic conditions are added to check whether value is null or not

Select  * 
From    tblEmployees 
where   EmployeeName =  Case 
                            When @EmployeeName Is Not Null 
                                Then @EmployeeName 
                            Else EmployeeName 
                        End 

But I need to add IN () Conditions and the parameter with in the IN () could be null or blank also ,if the parameter /string which is passed to the IN condition is blank then i donot want to add that condition in the query.

So how can i Achieve this.A helping hand will be very useful for me.

Thanks and Regards,
D.Mahesh

Answer 1

Depending on value of your parameter (blank of not), you can create SQL string accordingly.

DECLARE @sqlCommand VARCHAR(1000)
IF(ISNULL(@YourParameter,'')='')
    @sqlCommand = 'your query goes here'
ELSE
    @sqlCommand = 'your query goes here'

and then, run it using dynamic query execution

EXEC (@sqlCommand)

If not dynamic query then,

SELECT ....
FROM ....
WHERE CASE WHEN ISNULL(@YourParameter,'')='' THEN '' ELSE EmployeeName END IN (ISNULL(@YourParameter,''))

See if this works…