Question

My requirement is to send Columnname as Parameter to Stored procedure and do SUM on that Column.

I have written a small stored procedure to accept the column name as a parameter and do sum on that but I am getting an error with it.

CREATE PROCEDURE dbo.testCol
    -- Add the parameters for the stored procedure here
    @type as nvarchar(20),
    @beginDate as smalldatetime,
    @endDate as smalldatetime
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here


        select dbo.mytable.date, sum(@type) as quantity 
        from dbo.mytable
            where dbo.mytable.Date between @beginDate AND @endDate
        group by dbo.mytable.date,dbo.mytable.day 
        order by dbo.mytable.date
END
GO

I am getting the error as "Operand data type nvarchar is invalid for sum operator." while executing this stored procedure.

Any help much appreciated.

Thanks

Answer 1

You’ll need to use dynamic sql to get the passed column name to be used this way in the query.

Use sp_executesql and include the column name in the string, and pass @beginDate and @endDate as parameters.