Oracle creating a table

How should we create a table which has a column as开发者_StackOverflow社区 the average of the totals present in previous columns? For ex :Departments (depno,depname,noofempl,totalsal,avgsal)

here value in avgsal must be (totalsal/noofempl)

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If you are using Oracle 11 you might use virtual columns otherwise you can create a view that selects all your table columns and adds the average column

CREATE TABLE DEPARTMENTS
(
  DEPNO...
  DEPNAME...
  noofempl...
  totalsal...
);

CREATE VIEW VW_DEPARMENTS AS
SELECT DEPNO, DEPNAME, noofempl, totalsal, totalsal/noofempl as avgsal
FROM DEPARTMENTS;