Hi There,
In databases like Oracle & Sql-Server...There is no concept of File....The Databases r stored in Oracle it self & u have to call them or make them thru SQL(Structured Query Language)... Learing Or Teaching Process is not possible here..take some good book work out the examples & understand the concept...The connection to oracle frm diff front ends have diff ways...

Here is a exp of a sql to make a database in Oracle

Create Database <database name>

Table Creation

Create Table <Table name> (<field name> <datatyppe>(<size>),
<field name> <datatyppe>(<size>))

eg :- Create table emp (Ecode Number(8), Ename(varchar(50))

...
Best of Luck .. Practise & u will get the way..

Regards Rohan(India)