Insert default value when null is inserted

Question

I have an Oracle database, and a table with several not null columns, all with default values.

I would like to use one insert statement for any data I want to insert, a

Answer 1

For those who reading it now:

In Oracle 12c there is new feature: DEFAULT ON NULL. For example:

CREATE TABLE tab1 (
  col1        NUMBER DEFAULT 5,
  col2        NUMBER DEFAULT ON NULL 7,
  description VARCHAR2(30)
);

So when you try to INSERT null in col2, this will automatically be 7.