In the "Oracle Database 10g: A Beginer's Guide" in Chapter 2 a sample database is discussed with the tables customers, products, sales and costs. You need have it to try it the examples. How can I obtain it?
I have Oracle10gRelease2(10_2_0_1_0) installed on Windows XP Pro SP2.
What is the link of:
"Oracle Database 10g: A Beginer's Guide"?
Maybe this is only a sample schema in a database, not a sample database.
Create a new one and you will have this sample schema and tables.