In a SQL select statement. (original code VFP 5) I came across the code below as part of the WHERE clause

(Empty(?ThisForm.Customer) or  ?ThisForm.Customer= Ordhead.customerid)

As stated previously, empty is not rushmore optimizable, therefore how do I change this to return the same info. I am rewriting the queries in VFP 9 and wish to get the same results.

Mike