3.4. Working with Schema Objects
A schema is collection of database objects owned by a specific database user. In an Oracle10g database, the schema has the same name as the database user, so the two terms are synonymous.
Schema objects include the segments (tables, indexes, and so on) you have seen in tablespaces as well as nonsegment database objects owned by a user. These nonsegment objects include constraints, views, synonyms, procedures, and packages. Database objects that are not owned by one user and thus are not schema objects include roles, tablespaces, and directories.
In this section, you will learn about the built-in datatypes that Oracle provides for use in your tables, how to create and manage tables, how to implement business rules ...