>

select * from customer where exists (select * from orders)

result in C5 error. Expected no error (not talking about SQL being logical or not).
>Cetin

Worked for me also.

CREATE CURSOR customer (Fld1 Int, Fld2 Int , Fld3 Int , Fld4 Int , Fld5 Int , Fld6 Int )
FOR asd  = 1 TO 50
    APPEND BLANK IN Customer
NEXT
CREATE CURSOR Orders (Fld1 Int, Fld2 Int , Fld3 Int , Fld4 Int , Fld5 Int , Fld6 Int )
FOR asd  = 1 TO 250
    APPEND BLANK IN Orders
NEXT

select * from customer where exists (select * from orders)

CLOSE DATA ALL
SET PATH TO (HOME(2)+[Northwind])
select * from customers where exists (select * from orders)