Which Platform or Version?

In general, all of the discussions and examples in this tutorial apply regardless of the machine and/or operating system you are using. In those few cases where a feature is in any way system-dependent, I note that in the text.

There are many versions of PL/SQL, and you may even find that you need to use multiple versions in your development work. Introduction to PL/SQL describes in detail the many versions of PL/SQL and what you need to know about them; see "PL/SQL Versions" in in .