Microsoft SQL Server has a feature called user-defined field types. User-defined data types are basically aliases for the underlying Microsoft SQL Server data types. Iron Speed Designer treats these user-defined field types as the underlying Microsoft SQL Server data types. For example, a user-defined data type called BriansBigInt is really just an alias for the underlying “bigint” data type. When Iron Speed Designer queries the Microsoft SQL Server to read the table schema, Iron Speed Designer sees only the true underlying Microsoft SQL Server data types. That is, Iron Speed Designer only sees "bigint", not "BriansBigInt". Accordingly, this allows Iron Speed Designer to properly handle user-defined field types.