PL/SQL identifiers are constants, variables, exceptions, procedures, cursors, and reserved words.
The identifiers consist of a letter optionally followed by more letters, numerals, dollar signs, underscores, and number signs and should not exceed 30 characters.
By default, identifiers are not case-sensitive. So you can use integer or INTEGER to represent a numeric value. You cannot use a reserved keyword as an identifier.
| Delimiter | Description |
|---|---|
| +, -, *, / | Addition, subtraction/negation, multiplication, division |
| % | Attribute indicator |
| ‘ | Character string delimiter |
| . | Component selector |
| (,) | Expression or list delimiter |
| : | Host variable indicator |
| , | Item separator |
| “ | Quoted identifier delimiter |
| = | Relational operator |
| @ | Remote access indicator |
| ; | Statement terminator |
| := | Assignment operator |
| <<, >> | Label delimiter (begin and end) |
| ** | Exponentiation operator |
| || | Concatenation operator |
| <>, ‘=, ~=, ^= | Different versions of NOT EQUAL |
| <, >, <=, >= | Relational operators |
| .. | Range operator |
| – | Single-line comment indicator |
| /*, */ | Multi-line comment delimiter (begin and end) |
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