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
Isaac Barrow, Cambridge's first professor of mathematics, steered Newton away from the standard undergraduate texts and towards the big unsolved mathematical problems of the day, such as calculus-a way of describing how things change. Calculus would later be crucial for explaining the universe in mathematical terms. Newton also hunted out new works by men such as Descartes, who argued that the Universe was governed by mechanical laws. Plato is my friend, Aristotle is my friend, but my best friend is truth.