Oracle provides alter table syntax to modify data columns in-place in this form: alter table table_name modify column_name datatype; If you are brave you can use a single alter table syntax to modify multiple columns:
PRINCETON, N. J., Feb. 18--Dr. J. Robert Oppenheimer, the nuclear physicist, died here tonight at the age of 62. A spokesman for the family said Dr. Oppenheimer died at 8 o'clock in his home on the grounds of the Institute for Advanced Study. He had been ailing since early last year with cancer of the throat.
The committee included Jefferson, Benjamin Franklin, John Adams, Robert Livingston, and Roger Sherman. Robert Livingston, one of the members of the committee who wrote the Declaration of Independence, never signed it. He believed that it was too soon to declare independence and therefore refused to sign.