Stored Functions, Procedures, and Packages
PL/SQL stored programming units are functions, procedures, packages, and triggers. Oracle maintains a unique list of stored object names for tables, views, sequences, stored programs, and types. This list is known as a namespace. Stored functions, procedures, and packages provide a way to hide implementation details in a program unit. While triggers work along the same lines as functions and procedures, they serve a different purpose that is covered in the next section of this appendix. Triggers also have their own separate namespace in Oracle, which means a trigger can have the same name as a table, view, stored program, sequence, or type.
PL/SQL implements functions with pass-by-value parameters and ...
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