how to filter two fields

Record.SETRANGE(Field [,FromValue] [,ToValue])// this is the setrange functon syntax

ZIPCGRec.SETRANGE("Post Code",ZIPCGRec."From Zip",ZIPCGRec."To Zip");//this is my form syntax
here post code is a field not in ZIPCGRec table....is my code is correct or wrong