annotation flag: Clicking on the links within sections marked by ¿? will display additional information in the Annotation Window on the right of the screen. Annotated sections of a document typically include blocks of code, output displays, and table contents.
NUMBER(10): Oracle DBMS integer number, maximum 10 digits. The standard datatype used for most integers.
VARCHAR2(length): Oracle DBMS variable-length character string. Used for non-indexed strings over 19 characters in length. length denotes the maximum number of characters the string can contain.