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
There are 40 authors of the books of the Bible. Most of them we know, but there are anonymous writers too. Some of the authors wrote one book, some wrote several. Moses is credited for the first five books of the Old Testament: Genesis, Exodus, Leviticus, Numbers, and Deuteronomy which are called the Pentetuch. These books cover creation to his own death at the end of Deuteronomy.