PL/SQL User's Guide and Reference
Character Set
You write a PL/SQL program as lines of text using a specific set of characters. The PL/SQL character set includes
- the upper and lowercase letters A .. Z, a .. z
- tabs, spaces, and carriage returns
- the symbols ( ) + - * / < > = ! ~ ; : . ' @ % , " # $ ^ & _ | { } ? [ ]
PL/SQL is not case sensitive, so lowercase letters are equivalent to corresponding uppercase letters except within string and
character literals.