When you interact with an Oracle database, you do so
with a given identity that can take certain actions.
This identity is represented by an Oracle user.
The actions the user takes occur within a subsection
of the database that can have database objects associated
with it. This subsection is known as a schema.
The Oracle HR Schema contains Human Resources data
for a fictional company. The tables and data provide
an area where you can experiment with Oracle Database
features without concern of damaging production data.
The tables and relationships are structured in a way
that allows for the use of most of the features of SQL.
In addition, most of the examples in Oracle's own
documentation utilize data from the HR Schema.