Derive A Column Based On Other Derived Column In A Table .. Is It Possible ?

Table structure as follows



Employee

Empno empname salary
commission



I want to have an other employee table named employee_modified

Empno empname salary
commission derived_column1(salary+commission)
derived_column2(derived_column1 + xxxx) and so on derive other
columns based on the earlier derived columns)

Is that possible to do it.. or am I doing something wrong.



something like



Select empno , empname , salary , commission,

(salary + commission) as derived_colum1 ,

(derived_colum1 + xxxxx) as derived_colum2 ,

(derived_colum2 + xxxxx) as derived_colum3

into employee_modified from employee