The Lexical Set of Elements : Introduction « PL SQL Programming « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial

1.	Introduction
2.	Query Select
3.	Set
4.	Insert Update Delete
5.	Sequences
6.	Table
7.	Table Joins
8.	View
9.	Index
10.	SQL Data Types
11.	Character String Functions
12.	Aggregate Functions
13.	Date Timestamp Functions
14.	Numerical Math Functions
15.	Conversion Functions
16.	Analytical Functions
17.	Miscellaneous Functions
18.	Regular Expressions Functions
19.	Statistical Functions
20.	Linear Regression Functions
21.	PL SQL Data Types
22.	PL SQL Statements
23.	PL SQL Operators
24.	PL SQL Programming
25.	Cursor
26.	Collections
27.	Function Procedure Packages
28.	Trigger
29.	SQL PLUS Session Environment
30.	System Tables Data Dictionary
31.	System Packages
32.	Object Oriented
33.	XML
34.	Large Objects
35.	Transaction
36.	User Privilege

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Oracle PL/SQL Tutorial » PL SQL Programming » Introduction

24. 1. 6. The Lexical Set of Elements

The PL/SQL lexical set of elements consists of identifiers, delimiters, literals, and comments.
Identifiers are names of PL/SQL program items and units.
These items and units could be of different kinds - constants, variables, exceptions, cursors, cursor variables, subprograms, and packages.
An identifier cannot exceed 30 characters.
An identifier consists of a letter optionally followed by more letters, numerals, dollar signs, underscores, and number signs.
By default, identifiers are not case sensitive.
Identifiers may not be the same as reserved words, so you cannot use the word end as a variable name.

24. 1. Introduction
	24. 1. 1.	Writing a simple program
	24. 1. 2.	Each complete line of the PL/SQL code must end with a semicolon (;).
	24. 1. 3.	Anonymous Block Structure
	24. 1. 4.	An example of an anonymous block.
	24. 1. 5.	Anonymous blocks can be nested in the procedure and exception blocks in as many levels as you want
	24. 1. 6.	The Lexical Set of Elements
	24. 1. 7.	Delimiters
	24. 1. 8.	Comments
	24. 1. 9.	Multi-line comments start with /* and end with */.
	24. 1. 10.	Declaring variables
	24. 1. 11.	Declaring a Variable by Reference
	24. 1. 12.	There are some restrictions on the declaration of variables:
	24. 1. 13.	Assigning values to variables
	24. 1. 14.	Assign SQL query results to PL/SQL variables
	24. 1. 15.	Literals as variable values
	24. 1. 16.	Examples of Integer and Real Literals
	24. 1. 17.	Numeric literals cannot contain dollar signs or commas, but they can be written in scientific notation
	24. 1. 18.	Character and string literals in the Oracle world are enclosed by single quotes

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