Simple
identifier. The first character in a simple identifier must not be a digit or underscore.Syntax
<simple_identifier> ::= <first_character>[<identifier_tail_character>...]
first_character, identifier_tail_characterExplanation
Simple identifiers are always converted into uppercase characters in the database. For this reason, simple identifiers are not case sensitive.
If the name of a database object is to contain lowercase letters, special characters, or blanks, the identifier must be specified as a
special identifier (in double quotes).