Appendix I. PL/SQL Primer
The Procedure Language/Structured Query Language (PL/SQL) was developed by Oracle in the late 1980s. Originally, PL/SQL had limited capabilities, but that changed in the early 1990s. PL/SQL provides the Oracle database with an interpreted and operating system–independent programming environment. SQL is natively integrated in the PL/SQL language, and PL/SQL programs can be called directly from the command-line SQL*Plus interface covered in Appendix G. This appendix assumes you have basic familiarity with operating in the SQL*Plus environment, and that you will read it sequentially.
The PL/SQL language is a robust tool with many options. As a PL/SQL primer, the appendix introduces
Oracle PL/SQL block structure
Variables, ...
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