Rules for creating a table

Table names & column names must begin with a letter and be 1–30 characters.
Table names must begin with a character A–Z or a–z.
Names may contain characters, numerals and special characters like A–Z, a–z,0–9, _ (underscore), $, and # (legal characters, but their use is discouraged).
The name must not be same as the name of any other object in your schema.
Names must not be an Oracle Server reserved word.
Table names are not case sensitive. If you create a table with upper, lower or a mixed case the table’s names are stored only the upper case in the data dictionary.
If you want to create a table with the name in lower case characters, then you must enclose the table name within double quotes while creating the table.
The no of columns in a table can be up to a maximum of 1000.
The column names in the table must be unique. However, column names can be duplicated across tables.

Syntax:

CREATE TABLE [schema.]
(
  [DEFAULT ] [,…..]
);

Example:

CREATE TABLE dept
(
deptno NUMBER(2),
dname VARCHAR2(14),
loc VARCHAR2(13)
);