Oracle Database 11g PL SQL Programming Book
The 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 a built-in interpreted and operating system–independent programming environment. SQL statements are natively integrated in the PL/SQL language. You can also call PL/SQL directly from the command-line SQL*Plus interface. Similar direct calls can be made in your external programming language calls to the database, as illustrated in Appendices C and D. The Oracle 8 Database introduced object types into the database. It moved the Oracle database from a purely relational model into an object-relational (or extended relational) model. These types were of limited value as collections of scalar variables until they became instantiable in Oracle 9i, Release 2. The ability to instantiate SQL object types made internal Oracle objects compatible with C++, Java, or C# object types. SQL object types are implemented in PL/SQL and are covered in Chapter 15.
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