Search Table ? Parameter - Essentials 4.1.2

While using the search data linking video as a guide, dated March 8, 2012,  I'm attempting to use the "?" parameter in my new search table, but I receive an error after I test my search table at it's rest end point. I'm using Essentials v4.1.2

/customer/servlet/servlet.FileDownload?file=00P6000000elzlhEAA

Below is my current search table sql statement:

SELECT composite_key, interred_persons FROM GIS_StoneOrchard.dbo.GIS_cemetery_sites WHERE composite_key = @Comp_ID And interred_persons = ?

Is the "?" still a valid input parameter for a search table?

Walter