Here are some examples of Oracle alter table syntax to modify data columns and note that you can add constraints like NOT NULL: ALTER TABLE customer MODIFY (cust_name varchar2(100) not null, cust_hair_color varchar2(20)) ;
Did Sir Isaac Newton write any books? His best known book is Principia (Philosophiae Naturalis Principia Mathematica) published in 1687; which includes his laws of motion. Edit
Newton's 1687 Mathematical Principles of Natural Philosophy is classified in the 2000s as a book of physics; he used the term natural philosophy because it used to encompass disciplines that later became associated with sciences such as astronomy, medicine and physics.