Is PL/SQL an extended dialect of SQL?
Calling PL/SQL "a combination of SQL along with the procedural features of programming languages" might give the impression that it is an extended dialect of SQL, when in fact it is an in-database compiled programming language that embeds SQL natively.
What do PL/SQL and Oracle Forms have in common?
The only thing they have in common is direct embedding of SQL statements, and storage and execution inside a database. (In Oracle Forms, PL/SQL is even used for client-side code, though integration with database-stored PL/SQL is (almost) seemless)
What are the data types of Oracle PL/SQL variable identifiers?
CHARACTER Data Type: 3. NUMBER Data Type: 4. BOOLEAN Data Type: 5. DATE Data Type: 6. LOB Data Type: Chapter 6: Oracle PL/SQL Variable Identifiers Tutorial with Examples