Data Model with Calculations

Hi,

I am creating a data model using standard SQL query where I want to have a calculated column.  My select statement is as follows:

SELECT

     "Table"."Field1" as "Field1,

     "Table"."Field2" as "Field2,

     "Table"."Field1" - "Table"."Field2" *.3 AS "Field3"
FROM "Table";

I keep getting an error message not able to load SQL.  Can you advise how I can go about resolving this and getting the result I need?

Thanks!