CHAPTER 2

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Blocks, Functions, and Procedures

In this chapter, as the title suggests, you’ll learn about the foundational structures of PL/SQL: blocks, functions, and procedures. Blocks define the structures upon which functions and procedures are built. Functions and procedures are very similar, but distinct, in that a function returns a value to a calling function or procedure, while a procedure does not. So let’s begin our discussion of PL/SQL by starting with its foundation: the block.

Blocks

The Procedure Language extension for SQL (PL/SQL) has a block structure. Every piece of code executes in a block, similar to Java, JavaScript, and PHP’s ...

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